diff --git a/.travis.yml b/.travis.yml
index 103c78cc..fcea1c27 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,5 @@
 language: python
 python:
-  - "2.7"
   - "3.5"
   - "3.6"
   - "3.7"
@@ -26,4 +25,4 @@ deploy:
   on:
     tags: true
     repo: PyGithub/PyGithub
-    python: "2.7"
+    python: "3.5"
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 4c5f5467..5fead8c0 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -91,8 +91,6 @@ Please check your code with [pep8 Python style guide checker](http://pypi.python
 
 ## Build documentation locally
 
-Note: only Python 2 is supported as of now
-
 ```
 pip install -r requirements.txt
 sphinx-build doc build
diff --git a/DEPLOY.md b/DEPLOY.md
index 8417c555..acab27fe 100644
--- a/DEPLOY.md
+++ b/DEPLOY.md
@@ -13,6 +13,6 @@ Next version number? (previous: 'XXX')
 
 3. Now the push will be on hold until you press Enter. Manually inpect the changelog (`doc/changes.rst`) to make changes if necessary. Once you are sure, go back and press Enter. 
 
-4. Once the travis job (Python2.7) is done, the new version should be uploaded to PyPI. 
+4. Once the travis job (Python 3.5) is done, the new version should be uploaded to PyPI.
 
 5. Update the Github [release](https://github.com/PyGithub/PyGithub/releases) page with the same release note from `doc/changes.rst`. (needed for some web spiders for changelog parsing)
diff --git a/README.md b/README.md
index c9ea62df..2d9dcef1 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,7 @@
 [![codecov](https://codecov.io/gh/PyGithub/PyGithub/branch/master/graph/badge.svg)](https://codecov.io/gh/PyGithub/PyGithub)
 [![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
 
-PyGitHub is a Python (2 and 3) library to access the [GitHub API v3] and [Github Enterprise API v3].
+PyGitHub is a Python library to access the [GitHub API v3] and [Github Enterprise API v3].
 This library enables you to manage [GitHub] resources such as repositories, user profiles, and organizations in your Python applications.
 
 [GitHub API v3]: https://developer.github.com/v3
diff --git a/doc/examples/Webhook.rst b/doc/examples/Webhook.rst
index b64317a4..44b0d491 100644
--- a/doc/examples/Webhook.rst
+++ b/doc/examples/Webhook.rst
@@ -16,8 +16,6 @@ on working with Webhooks. A list of all applicable event types for Webhooks can
 
 .. code-block:: python
 
-    from __future__ import print_function
-
     from wsgiref.simple_server import make_server
     from pyramid.config import Configurator
     from pyramid.view import view_config, view_defaults
diff --git a/doc/introduction.rst b/doc/introduction.rst
index ea4dccae..2516295e 100644
--- a/doc/introduction.rst
+++ b/doc/introduction.rst
@@ -1,7 +1,7 @@
 Introduction
 ============
 
-PyGithub is a Python (2 and 3) library to use the `Github API v3 <http://developer.github.com/v3>`__.
+PyGithub is a Python library to use the `Github API v3 <http://developer.github.com/v3>`__.
 With it, you can manage your `Github <http://github.com>`__ resources (repositories, user profiles, organizations, etc.) from Python scripts.
 
 Should you have any question, any remark, or if you find a bug,
diff --git a/github/AuthenticatedUser.py b/github/AuthenticatedUser.py
index 9538157f..5bdf88cc 100644
--- a/github/AuthenticatedUser.py
+++ b/github/AuthenticatedUser.py
@@ -40,12 +40,8 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import datetime
 
-import six
-
 import github.Authorization
 import github.Event
 import github.Gist
@@ -377,9 +373,7 @@ class AuthenticatedUser(github.GithubObject.CompletableGithubObject):
         :param email: string
         :rtype: None
         """
-        assert all(
-            isinstance(element, (str, six.text_type)) for element in emails
-        ), emails
+        assert all(isinstance(element, str) for element in emails), emails
         post_parameters = emails
         headers, data = self._requester.requestJsonAndCheck(
             "POST", "/user/emails", input=post_parameters
@@ -451,22 +445,20 @@ class AuthenticatedUser(github.GithubObject.CompletableGithubObject):
         :rtype: :class:`github.Authorization.Authorization`
         """
         assert scopes is github.GithubObject.NotSet or all(
-            isinstance(element, (str, six.text_type)) for element in scopes
+            isinstance(element, str) for element in scopes
         ), scopes
-        assert note is github.GithubObject.NotSet or isinstance(
-            note, (str, six.text_type)
-        ), note
+        assert note is github.GithubObject.NotSet or isinstance(note, str), note
         assert note_url is github.GithubObject.NotSet or isinstance(
-            note_url, (str, six.text_type)
+            note_url, str
         ), note_url
         assert client_id is github.GithubObject.NotSet or isinstance(
-            client_id, (str, six.text_type)
+            client_id, str
         ), client_id
         assert client_secret is github.GithubObject.NotSet or isinstance(
-            client_secret, (str, six.text_type)
+            client_secret, str
         ), client_secret
         assert onetime_password is None or isinstance(
-            onetime_password, (str, six.text_type)
+            onetime_password, str
         ), onetime_password
         post_parameters = dict()
         if scopes is not github.GithubObject.NotSet:
@@ -516,15 +508,14 @@ class AuthenticatedUser(github.GithubObject.CompletableGithubObject):
         """
         assert isinstance(public, bool), public
         assert all(
-            isinstance(element, github.InputFileContent)
-            for element in six.itervalues(files)
+            isinstance(element, github.InputFileContent) for element in files.values()
         ), files
         assert description is github.GithubObject.NotSet or isinstance(
-            description, (str, six.text_type)
+            description, str
         ), description
         post_parameters = {
             "public": public,
-            "files": {key: value._identity for key, value in six.iteritems(files)},
+            "files": {key: value._identity for key, value in files.items()},
         }
         if description is not github.GithubObject.NotSet:
             post_parameters["description"] = description
@@ -540,8 +531,8 @@ class AuthenticatedUser(github.GithubObject.CompletableGithubObject):
         :param key: string
         :rtype: :class:`github.UserKey.UserKey`
         """
-        assert isinstance(title, (str, six.text_type)), title
-        assert isinstance(key, (str, six.text_type)), key
+        assert isinstance(title, str), title
+        assert isinstance(key, str), key
         post_parameters = {
             "title": title,
             "key": key,
@@ -586,12 +577,12 @@ class AuthenticatedUser(github.GithubObject.CompletableGithubObject):
         :param allow_rebase_merge: bool
         :rtype: :class:`github.Repository.Repository`
         """
-        assert isinstance(name, (str, six.text_type)), name
+        assert isinstance(name, str), name
         assert description is github.GithubObject.NotSet or isinstance(
-            description, (str, six.text_type)
+            description, str
         ), description
         assert homepage is github.GithubObject.NotSet or isinstance(
-            homepage, (str, six.text_type)
+            homepage, str
         ), homepage
         assert private is github.GithubObject.NotSet or isinstance(
             private, bool
@@ -612,10 +603,10 @@ class AuthenticatedUser(github.GithubObject.CompletableGithubObject):
             auto_init, bool
         ), auto_init
         assert license_template is github.GithubObject.NotSet or isinstance(
-            license_template, (str, six.text_type)
+            license_template, str
         ), license_template
         assert gitignore_template is github.GithubObject.NotSet or isinstance(
-            gitignore_template, (str, six.text_type)
+            gitignore_template, str
         ), gitignore_template
         assert allow_squash_merge is github.GithubObject.NotSet or isinstance(
             allow_squash_merge, bool
@@ -683,27 +674,19 @@ class AuthenticatedUser(github.GithubObject.CompletableGithubObject):
         :param bio: string
         :rtype: None
         """
-        assert name is github.GithubObject.NotSet or isinstance(
-            name, (str, six.text_type)
-        ), name
-        assert email is github.GithubObject.NotSet or isinstance(
-            email, (str, six.text_type)
-        ), email
-        assert blog is github.GithubObject.NotSet or isinstance(
-            blog, (str, six.text_type)
-        ), blog
+        assert name is github.GithubObject.NotSet or isinstance(name, str), name
+        assert email is github.GithubObject.NotSet or isinstance(email, str), email
+        assert blog is github.GithubObject.NotSet or isinstance(blog, str), blog
         assert company is github.GithubObject.NotSet or isinstance(
-            company, (str, six.text_type)
+            company, str
         ), company
         assert location is github.GithubObject.NotSet or isinstance(
-            location, (str, six.text_type)
+            location, str
         ), location
         assert hireable is github.GithubObject.NotSet or isinstance(
             hireable, bool
         ), hireable
-        assert bio is github.GithubObject.NotSet or isinstance(
-            bio, (str, six.text_type)
-        ), bio
+        assert bio is github.GithubObject.NotSet or isinstance(bio, str), bio
         post_parameters = dict()
         if name is not github.GithubObject.NotSet:
             post_parameters["name"] = name
@@ -730,7 +713,7 @@ class AuthenticatedUser(github.GithubObject.CompletableGithubObject):
         :param id: integer
         :rtype: :class:`github.Authorization.Authorization`
         """
-        assert isinstance(id, six.integer_types), id
+        assert isinstance(id, int), id
         headers, data = self._requester.requestJsonAndCheck(
             "GET", "/authorizations/" + str(id)
         )
@@ -818,20 +801,14 @@ class AuthenticatedUser(github.GithubObject.CompletableGithubObject):
         :param since: datetime.datetime
         :rtype: :class:`github.PaginatedList.PaginatedList` of :class:`github.Issue.Issue`
         """
-        assert filter is github.GithubObject.NotSet or isinstance(
-            filter, (str, six.text_type)
-        ), filter
-        assert state is github.GithubObject.NotSet or isinstance(
-            state, (str, six.text_type)
-        ), state
+        assert filter is github.GithubObject.NotSet or isinstance(filter, str), filter
+        assert state is github.GithubObject.NotSet or isinstance(state, str), state
         assert labels is github.GithubObject.NotSet or all(
             isinstance(element, github.Label.Label) for element in labels
         ), labels
-        assert sort is github.GithubObject.NotSet or isinstance(
-            sort, (str, six.text_type)
-        ), sort
+        assert sort is github.GithubObject.NotSet or isinstance(sort, str), sort
         assert direction is github.GithubObject.NotSet or isinstance(
-            direction, (str, six.text_type)
+            direction, str
         ), direction
         assert since is github.GithubObject.NotSet or isinstance(
             since, datetime.datetime
@@ -873,20 +850,14 @@ class AuthenticatedUser(github.GithubObject.CompletableGithubObject):
         :param since: datetime.datetime
         :rtype: :class:`github.PaginatedList.PaginatedList` of :class:`github.Issue.Issue`
         """
-        assert filter is github.GithubObject.NotSet or isinstance(
-            filter, (str, six.text_type)
-        ), filter
-        assert state is github.GithubObject.NotSet or isinstance(
-            state, (str, six.text_type)
-        ), state
+        assert filter is github.GithubObject.NotSet or isinstance(filter, str), filter
+        assert state is github.GithubObject.NotSet or isinstance(state, str), state
         assert labels is github.GithubObject.NotSet or all(
             isinstance(element, github.Label.Label) for element in labels
         ), labels
-        assert sort is github.GithubObject.NotSet or isinstance(
-            sort, (str, six.text_type)
-        ), sort
+        assert sort is github.GithubObject.NotSet or isinstance(sort, str), sort
         assert direction is github.GithubObject.NotSet or isinstance(
-            direction, (str, six.text_type)
+            direction, str
         ), direction
         assert since is github.GithubObject.NotSet or isinstance(
             since, datetime.datetime
@@ -914,7 +885,7 @@ class AuthenticatedUser(github.GithubObject.CompletableGithubObject):
         :param id: integer
         :rtype: :class:`github.UserKey.UserKey`
         """
-        assert isinstance(id, six.integer_types), id
+        assert isinstance(id, int), id
         headers, data = self._requester.requestJsonAndCheck(
             "GET", "/user/keys/" + str(id)
         )
@@ -935,7 +906,7 @@ class AuthenticatedUser(github.GithubObject.CompletableGithubObject):
         :rtype: :class:`github.Notification.Notification`
         """
 
-        assert isinstance(id, (str, six.text_type)), id
+        assert isinstance(id, str), id
         headers, data = self._requester.requestJsonAndCheck(
             "GET", "/notifications/threads/" + id
         )
@@ -1013,7 +984,7 @@ class AuthenticatedUser(github.GithubObject.CompletableGithubObject):
         :param name: string
         :rtype: :class:`github.Repository.Repository`
         """
-        assert isinstance(name, (str, six.text_type)), name
+        assert isinstance(name, str), name
         headers, data = self._requester.requestJsonAndCheck(
             "GET", "/repos/" + self.login + "/" + name
         )
@@ -1039,19 +1010,15 @@ class AuthenticatedUser(github.GithubObject.CompletableGithubObject):
         :rtype: :class:`github.PaginatedList.PaginatedList` of :class:`github.Repository.Repository`
         """
         assert visibility is github.GithubObject.NotSet or isinstance(
-            visibility, (str, six.text_type)
+            visibility, str
         ), visibility
         assert affiliation is github.GithubObject.NotSet or isinstance(
-            affiliation, (str, six.text_type)
+            affiliation, str
         ), affiliation
-        assert type is github.GithubObject.NotSet or isinstance(
-            type, (str, six.text_type)
-        ), type
-        assert sort is github.GithubObject.NotSet or isinstance(
-            sort, (str, six.text_type)
-        ), sort
+        assert type is github.GithubObject.NotSet or isinstance(type, str), type
+        assert sort is github.GithubObject.NotSet or isinstance(sort, str), sort
         assert direction is github.GithubObject.NotSet or isinstance(
-            direction, (str, six.text_type)
+            direction, str
         ), direction
         url_parameters = dict()
         if visibility is not github.GithubObject.NotSet:
@@ -1179,9 +1146,7 @@ class AuthenticatedUser(github.GithubObject.CompletableGithubObject):
         :param email: string
         :rtype: None
         """
-        assert all(
-            isinstance(element, (str, six.text_type)) for element in emails
-        ), emails
+        assert all(isinstance(element, str) for element in emails), emails
         post_parameters = emails
         headers, data = self._requester.requestJsonAndCheck(
             "DELETE", "/user/emails", input=post_parameters
@@ -1274,7 +1239,7 @@ class AuthenticatedUser(github.GithubObject.CompletableGithubObject):
         :rtype: :class:`github.Migration.Migration`
         """
         assert isinstance(repos, (list, tuple)), repos
-        assert all(isinstance(repo, (str, six.text_type)) for repo in repos), repos
+        assert all(isinstance(repo, str) for repo in repos), repos
         assert lock_repositories is github.GithubObject.NotSet or isinstance(
             lock_repositories, bool
         ), lock_repositories
diff --git a/github/Authorization.py b/github/Authorization.py
index e5b33f3b..3b3c9fbe 100644
--- a/github/Authorization.py
+++ b/github/Authorization.py
@@ -30,10 +30,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
-import six
-
 import github.AuthorizationApplication
 import github.GithubObject
 
@@ -143,19 +139,17 @@ class Authorization(github.GithubObject.CompletableGithubObject):
         :rtype: None
         """
         assert scopes is github.GithubObject.NotSet or all(
-            isinstance(element, (str, six.text_type)) for element in scopes
+            isinstance(element, str) for element in scopes
         ), scopes
         assert add_scopes is github.GithubObject.NotSet or all(
-            isinstance(element, (str, six.text_type)) for element in add_scopes
+            isinstance(element, str) for element in add_scopes
         ), add_scopes
         assert remove_scopes is github.GithubObject.NotSet or all(
-            isinstance(element, (str, six.text_type)) for element in remove_scopes
+            isinstance(element, str) for element in remove_scopes
         ), remove_scopes
-        assert note is github.GithubObject.NotSet or isinstance(
-            note, (str, six.text_type)
-        ), note
+        assert note is github.GithubObject.NotSet or isinstance(note, str), note
         assert note_url is github.GithubObject.NotSet or isinstance(
-            note_url, (str, six.text_type)
+            note_url, str
         ), note_url
         post_parameters = dict()
         if scopes is not github.GithubObject.NotSet:
diff --git a/github/AuthorizationApplication.py b/github/AuthorizationApplication.py
index 92d98f3b..c6b9bc50 100644
--- a/github/AuthorizationApplication.py
+++ b/github/AuthorizationApplication.py
@@ -30,8 +30,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.GithubObject
 
 
diff --git a/github/Branch.py b/github/Branch.py
index 60eb310b..6ae8b072 100644
--- a/github/Branch.py
+++ b/github/Branch.py
@@ -33,10 +33,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
-import six
-
 import github.BranchProtection
 import github.Commit
 import github.GithubObject
@@ -147,21 +143,17 @@ class Branch(github.GithubObject.NonCompletableGithubObject):
         """
         assert strict is github.GithubObject.NotSet or isinstance(strict, bool), strict
         assert contexts is github.GithubObject.NotSet or all(
-            isinstance(element, (str, six.text_type))
-            or isinstance(element, (str, six.text_type))
-            for element in contexts
+            isinstance(element, str) or isinstance(element, str) for element in contexts
         ), contexts
         assert enforce_admins is github.GithubObject.NotSet or isinstance(
             enforce_admins, bool
         ), enforce_admins
         assert dismissal_users is github.GithubObject.NotSet or all(
-            isinstance(element, (str, six.text_type))
-            or isinstance(element, (str, six.text_type))
+            isinstance(element, str) or isinstance(element, str)
             for element in dismissal_users
         ), dismissal_users
         assert dismissal_teams is github.GithubObject.NotSet or all(
-            isinstance(element, (str, six.text_type))
-            or isinstance(element, (str, six.text_type))
+            isinstance(element, str) or isinstance(element, str)
             for element in dismissal_teams
         ), dismissal_teams
         assert dismiss_stale_reviews is github.GithubObject.NotSet or isinstance(
@@ -285,9 +277,7 @@ class Branch(github.GithubObject.NonCompletableGithubObject):
         """
         assert strict is github.GithubObject.NotSet or isinstance(strict, bool), strict
         assert contexts is github.GithubObject.NotSet or all(
-            isinstance(element, (str, six.text_type))
-            or isinstance(element, (str, six.text_type))
-            for element in contexts
+            isinstance(element, str) or isinstance(element, str) for element in contexts
         ), contexts
 
         post_parameters = {}
@@ -340,13 +330,11 @@ class Branch(github.GithubObject.NonCompletableGithubObject):
         :required_approving_review_count: int
         """
         assert dismissal_users is github.GithubObject.NotSet or all(
-            isinstance(element, (str, six.text_type))
-            or isinstance(element, (str, six.text_type))
+            isinstance(element, str) or isinstance(element, str)
             for element in dismissal_users
         ), dismissal_users
         assert dismissal_teams is github.GithubObject.NotSet or all(
-            isinstance(element, (str, six.text_type))
-            or isinstance(element, (str, six.text_type))
+            isinstance(element, str) or isinstance(element, str)
             for element in dismissal_teams
         ), dismissal_teams
         assert dismiss_stale_reviews is github.GithubObject.NotSet or isinstance(
@@ -446,9 +434,7 @@ class Branch(github.GithubObject.NonCompletableGithubObject):
         :users: list of strings (user names)
         """
         assert all(
-            isinstance(element, (str, six.text_type))
-            or isinstance(element, (str, six.text_type))
-            for element in users
+            isinstance(element, str) or isinstance(element, str) for element in users
         ), users
 
         headers, data = self._requester.requestJsonAndCheck(
@@ -461,9 +447,7 @@ class Branch(github.GithubObject.NonCompletableGithubObject):
         :users: list of strings (user names)
         """
         assert all(
-            isinstance(element, (str, six.text_type))
-            or isinstance(element, (str, six.text_type))
-            for element in users
+            isinstance(element, str) or isinstance(element, str) for element in users
         ), users
 
         headers, data = self._requester.requestJsonAndCheck(
@@ -476,9 +460,7 @@ class Branch(github.GithubObject.NonCompletableGithubObject):
         :users: list of strings (user names)
         """
         assert all(
-            isinstance(element, (str, six.text_type))
-            or isinstance(element, (str, six.text_type))
-            for element in users
+            isinstance(element, str) or isinstance(element, str) for element in users
         ), users
 
         headers, data = self._requester.requestJsonAndCheck(
@@ -491,9 +473,7 @@ class Branch(github.GithubObject.NonCompletableGithubObject):
         :teams: list of strings (team slugs)
         """
         assert all(
-            isinstance(element, (str, six.text_type))
-            or isinstance(element, (str, six.text_type))
-            for element in teams
+            isinstance(element, str) or isinstance(element, str) for element in teams
         ), teams
 
         headers, data = self._requester.requestJsonAndCheck(
@@ -506,9 +486,7 @@ class Branch(github.GithubObject.NonCompletableGithubObject):
         :teams: list of strings (team slugs)
         """
         assert all(
-            isinstance(element, (str, six.text_type))
-            or isinstance(element, (str, six.text_type))
-            for element in teams
+            isinstance(element, str) or isinstance(element, str) for element in teams
         ), teams
 
         headers, data = self._requester.requestJsonAndCheck(
@@ -521,9 +499,7 @@ class Branch(github.GithubObject.NonCompletableGithubObject):
         :teams: list of strings (team slugs)
         """
         assert all(
-            isinstance(element, (str, six.text_type))
-            or isinstance(element, (str, six.text_type))
-            for element in teams
+            isinstance(element, str) or isinstance(element, str) for element in teams
         ), teams
 
         headers, data = self._requester.requestJsonAndCheck(
diff --git a/github/BranchProtection.py b/github/BranchProtection.py
index e56bef04..9ff7f162 100644
--- a/github/BranchProtection.py
+++ b/github/BranchProtection.py
@@ -22,8 +22,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.GithubObject
 import github.NamedUser
 import github.RequiredPullRequestReviews
diff --git a/github/Clones.py b/github/Clones.py
index b24e5893..1a2a1fe6 100644
--- a/github/Clones.py
+++ b/github/Clones.py
@@ -26,8 +26,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.GithubObject
 
 
diff --git a/github/Commit.py b/github/Commit.py
index 27cac62f..280b897c 100644
--- a/github/Commit.py
+++ b/github/Commit.py
@@ -32,10 +32,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
-import six
-
 import github.CommitCombinedStatus
 import github.CommitComment
 import github.CommitStats
@@ -150,15 +146,11 @@ class Commit(github.GithubObject.CompletableGithubObject):
         :param position: integer
         :rtype: :class:`github.CommitComment.CommitComment`
         """
-        assert isinstance(body, (str, six.text_type)), body
-        assert line is github.GithubObject.NotSet or isinstance(
-            line, six.integer_types
-        ), line
-        assert path is github.GithubObject.NotSet or isinstance(
-            path, (str, six.text_type)
-        ), path
+        assert isinstance(body, str), body
+        assert line is github.GithubObject.NotSet or isinstance(line, int), line
+        assert path is github.GithubObject.NotSet or isinstance(path, str), path
         assert position is github.GithubObject.NotSet or isinstance(
-            position, six.integer_types
+            position, int
         ), position
         post_parameters = {
             "body": body,
@@ -191,15 +183,15 @@ class Commit(github.GithubObject.CompletableGithubObject):
         :param context: string
         :rtype: :class:`github.CommitStatus.CommitStatus`
         """
-        assert isinstance(state, (str, six.text_type)), state
+        assert isinstance(state, str), state
         assert target_url is github.GithubObject.NotSet or isinstance(
-            target_url, (str, six.text_type)
+            target_url, str
         ), target_url
         assert description is github.GithubObject.NotSet or isinstance(
-            description, (str, six.text_type)
+            description, str
         ), description
         assert context is github.GithubObject.NotSet or isinstance(
-            context, (str, six.text_type)
+            context, str
         ), context
         post_parameters = {
             "state": state,
diff --git a/github/CommitCombinedStatus.py b/github/CommitCombinedStatus.py
index f23e65ca..c7c02a3c 100644
--- a/github/CommitCombinedStatus.py
+++ b/github/CommitCombinedStatus.py
@@ -26,8 +26,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.CommitStatus
 import github.GithubObject
 import github.Repository
diff --git a/github/CommitComment.py b/github/CommitComment.py
index 8dbce3b1..e6c98927 100644
--- a/github/CommitComment.py
+++ b/github/CommitComment.py
@@ -32,10 +32,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
-import six
-
 import github.GithubObject
 import github.NamedUser
 
@@ -151,7 +147,7 @@ class CommitComment(github.GithubObject.CompletableGithubObject):
         :param body: string
         :rtype: None
         """
-        assert isinstance(body, (str, six.text_type)), body
+        assert isinstance(body, str), body
         post_parameters = {
             "body": body,
         }
@@ -181,9 +177,7 @@ class CommitComment(github.GithubObject.CompletableGithubObject):
         :param reaction_type: string
         :rtype: :class:`github.Reaction.Reaction`
         """
-        assert isinstance(
-            reaction_type, (str, six.text_type)
-        ), "reaction type should be a string"
+        assert isinstance(reaction_type, str), "reaction type should be a string"
         assert reaction_type in [
             "+1",
             "-1",
diff --git a/github/CommitStats.py b/github/CommitStats.py
index 6b345e1a..e98fb210 100644
--- a/github/CommitStats.py
+++ b/github/CommitStats.py
@@ -29,8 +29,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.GithubObject
 
 
diff --git a/github/CommitStatus.py b/github/CommitStatus.py
index 8de27dd4..f6325e93 100644
--- a/github/CommitStatus.py
+++ b/github/CommitStatus.py
@@ -32,8 +32,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.GithubObject
 import github.NamedUser
 
diff --git a/github/Comparison.py b/github/Comparison.py
index 4b4efdf8..3a0eb4bd 100644
--- a/github/Comparison.py
+++ b/github/Comparison.py
@@ -29,8 +29,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.Commit
 import github.File
 import github.GithubObject
diff --git a/github/ContentFile.py b/github/ContentFile.py
index 7304f127..9b7d09dd 100644
--- a/github/ContentFile.py
+++ b/github/ContentFile.py
@@ -31,8 +31,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import base64
 
 import github.GithubObject
diff --git a/github/Download.py b/github/Download.py
index 7370930d..82871a0e 100644
--- a/github/Download.py
+++ b/github/Download.py
@@ -30,8 +30,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.GithubObject
 
 
diff --git a/github/Event.py b/github/Event.py
index fa100d74..a97299a1 100644
--- a/github/Event.py
+++ b/github/Event.py
@@ -30,8 +30,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.GithubObject
 import github.NamedUser
 import github.Organization
diff --git a/github/File.py b/github/File.py
index 1db06dc7..f040ac75 100644
--- a/github/File.py
+++ b/github/File.py
@@ -32,8 +32,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.GithubObject
 
 
diff --git a/github/Gist.py b/github/Gist.py
index a4e682f7..ca0e0a82 100644
--- a/github/Gist.py
+++ b/github/Gist.py
@@ -33,10 +33,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
-import six
-
 import github.GistComment
 import github.GistFile
 import github.GistHistoryState
@@ -211,7 +207,7 @@ class Gist(github.GithubObject.CompletableGithubObject):
         :param body: string
         :rtype: :class:`github.GistComment.GistComment`
         """
-        assert isinstance(body, (str, six.text_type)), body
+        assert isinstance(body, str), body
         post_parameters = {
             "body": body,
         }
@@ -247,11 +243,11 @@ class Gist(github.GithubObject.CompletableGithubObject):
         :rtype: None
         """
         assert description is github.GithubObject.NotSet or isinstance(
-            description, (str, six.text_type)
+            description, str
         ), description
         assert files is github.GithubObject.NotSet or all(
             element is None or isinstance(element, github.InputFileContent)
-            for element in six.itervalues(files)
+            for element in files.values()
         ), files
         post_parameters = dict()
         if description is not github.GithubObject.NotSet:
@@ -259,7 +255,7 @@ class Gist(github.GithubObject.CompletableGithubObject):
         if files is not github.GithubObject.NotSet:
             post_parameters["files"] = {
                 key: None if value is None else value._identity
-                for key, value in six.iteritems(files)
+                for key, value in files.items()
             }
         headers, data = self._requester.requestJsonAndCheck(
             "PATCH", self.url, input=post_parameters
@@ -272,7 +268,7 @@ class Gist(github.GithubObject.CompletableGithubObject):
         :param id: integer
         :rtype: :class:`github.GistComment.GistComment`
         """
-        assert isinstance(id, six.integer_types), id
+        assert isinstance(id, int), id
         headers, data = self._requester.requestJsonAndCheck(
             "GET", self.url + "/comments/" + str(id)
         )
diff --git a/github/GistComment.py b/github/GistComment.py
index dcdf10da..ec06caa3 100644
--- a/github/GistComment.py
+++ b/github/GistComment.py
@@ -30,10 +30,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
-import six
-
 import github.GithubObject
 import github.NamedUser
 
@@ -107,7 +103,7 @@ class GistComment(github.GithubObject.CompletableGithubObject):
         :param body: string
         :rtype: None
         """
-        assert isinstance(body, (str, six.text_type)), body
+        assert isinstance(body, str), body
         post_parameters = {
             "body": body,
         }
diff --git a/github/GistFile.py b/github/GistFile.py
index 7d4b656e..c9245116 100644
--- a/github/GistFile.py
+++ b/github/GistFile.py
@@ -30,8 +30,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.GithubObject
 
 
diff --git a/github/GistHistoryState.py b/github/GistHistoryState.py
index 83647f5f..ade2f3dd 100644
--- a/github/GistHistoryState.py
+++ b/github/GistHistoryState.py
@@ -29,8 +29,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.CommitStats
 import github.Gist
 import github.GithubObject
diff --git a/github/GitAuthor.py b/github/GitAuthor.py
index 1d7220b1..d7f5dc8a 100644
--- a/github/GitAuthor.py
+++ b/github/GitAuthor.py
@@ -30,8 +30,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.GithubObject
 
 
diff --git a/github/GitBlob.py b/github/GitBlob.py
index 3b4dc5fe..2db328d9 100644
--- a/github/GitBlob.py
+++ b/github/GitBlob.py
@@ -30,8 +30,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.GithubObject
 
 
diff --git a/github/GitCommit.py b/github/GitCommit.py
index 6f14a642..7c50847d 100644
--- a/github/GitCommit.py
+++ b/github/GitCommit.py
@@ -30,8 +30,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.GitAuthor
 import github.GithubObject
 import github.GitTree
diff --git a/github/GitObject.py b/github/GitObject.py
index edc992fc..ce2fd71f 100644
--- a/github/GitObject.py
+++ b/github/GitObject.py
@@ -30,8 +30,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.GithubObject
 
 
diff --git a/github/GitRef.py b/github/GitRef.py
index 2c64ff9c..36238f7d 100644
--- a/github/GitRef.py
+++ b/github/GitRef.py
@@ -30,10 +30,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
-import six
-
 import github.GithubObject
 import github.GitObject
 
@@ -84,7 +80,7 @@ class GitRef(github.GithubObject.CompletableGithubObject):
         :param force: bool
         :rtype: None
         """
-        assert isinstance(sha, (str, six.text_type)), sha
+        assert isinstance(sha, str), sha
         assert force is github.GithubObject.NotSet or isinstance(force, bool), force
         post_parameters = {
             "sha": sha,
diff --git a/github/GitRelease.py b/github/GitRelease.py
index 351f3bd9..712f7243 100644
--- a/github/GitRelease.py
+++ b/github/GitRelease.py
@@ -35,12 +35,8 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 from os.path import basename
 
-import six
-
 import github.GithubObject
 import github.GitReleaseAsset
 import github.NamedUser
@@ -195,13 +191,13 @@ class GitRelease(github.GithubObject.CompletableGithubObject):
         :rtype: :class:`github.GitRelease.GitRelease`
         """
         assert tag_name is github.GithubObject.NotSet or isinstance(
-            tag_name, (str, six.text_type)
+            tag_name, str
         ), "tag_name must be a str/unicode object"
         assert target_commitish is github.GithubObject.NotSet or isinstance(
-            target_commitish, (str, six.text_type)
+            target_commitish, str
         ), "target_commitish must be a str/unicode object"
-        assert isinstance(name, (str, six.text_type)), name
-        assert isinstance(message, (str, six.text_type)), message
+        assert isinstance(name, str), name
+        assert isinstance(message, str), message
         assert isinstance(draft, bool), draft
         assert isinstance(prerelease, bool), prerelease
         if tag_name is github.GithubObject.NotSet:
@@ -235,11 +231,9 @@ class GitRelease(github.GithubObject.CompletableGithubObject):
         :calls: `POST https://<upload_url>/repos/:owner/:repo/releases/:release_id/assets <https://developer.github.com/v3/repos/releases/#upload-a-release-asset>`_
         :rtype: :class:`github.GitReleaseAsset.GitReleaseAsset`
         """
-        assert isinstance(path, (str, six.text_type)), path
-        assert isinstance(label, (str, six.text_type)), label
-        assert name is github.GithubObject.NotSet or isinstance(
-            name, (str, six.text_type)
-        ), name
+        assert isinstance(path, str), path
+        assert isinstance(label, str), label
+        assert name is github.GithubObject.NotSet or isinstance(name, str), name
 
         post_parameters = {"label": label}
         if name is github.GithubObject.NotSet:
diff --git a/github/GitReleaseAsset.py b/github/GitReleaseAsset.py
index 158a0421..8d01c4f5 100644
--- a/github/GitReleaseAsset.py
+++ b/github/GitReleaseAsset.py
@@ -25,10 +25,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
-import six
-
 import github.GithubObject
 
 
@@ -165,8 +161,8 @@ class GitReleaseAsset(github.GithubObject.CompletableGithubObject):
         Update asset metadata.
         :rtype: github.GitReleaseAsset.GitReleaseAsset
         """
-        assert isinstance(name, (str, six.text_type)), name
-        assert isinstance(label, (str, six.text_type)), label
+        assert isinstance(name, str), name
+        assert isinstance(label, str), label
         post_parameters = {"name": name, "label": label}
         headers, data = self._requester.requestJsonAndCheck(
             "PATCH", self.url, input=post_parameters
diff --git a/github/GitTag.py b/github/GitTag.py
index fe108cb3..b6eeafb3 100644
--- a/github/GitTag.py
+++ b/github/GitTag.py
@@ -30,8 +30,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.GitAuthor
 import github.GithubObject
 import github.GitObject
diff --git a/github/GitTree.py b/github/GitTree.py
index 866d7866..ebb35270 100644
--- a/github/GitTree.py
+++ b/github/GitTree.py
@@ -30,8 +30,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.GithubObject
 import github.GitTreeElement
 
diff --git a/github/GitTreeElement.py b/github/GitTreeElement.py
index 937e63ca..cf7d21e8 100644
--- a/github/GitTreeElement.py
+++ b/github/GitTreeElement.py
@@ -30,8 +30,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.GithubObject
 
 
diff --git a/github/GithubObject.py b/github/GithubObject.py
index 0c7b3b54..ea60399b 100644
--- a/github/GithubObject.py
+++ b/github/GithubObject.py
@@ -32,13 +32,9 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import datetime
 from operator import itemgetter
 
-import six
-
 from . import Consts, GithubException
 
 
@@ -151,11 +147,11 @@ class GithubObject(object):
 
     @staticmethod
     def _makeStringAttribute(value):
-        return GithubObject.__makeSimpleAttribute(value, (str, six.text_type))
+        return GithubObject.__makeSimpleAttribute(value, str)
 
     @staticmethod
     def _makeIntAttribute(value):
-        return GithubObject.__makeSimpleAttribute(value, six.integer_types)
+        return GithubObject.__makeSimpleAttribute(value, int)
 
     @staticmethod
     def _makeFloatAttribute(value):
@@ -172,7 +168,7 @@ class GithubObject(object):
     @staticmethod
     def _makeTimestampAttribute(value):
         return GithubObject.__makeTransformedAttribute(
-            value, six.integer_types, datetime.datetime.utcfromtimestamp
+            value, int, datetime.datetime.utcfromtimestamp
         )
 
     @staticmethod
@@ -193,9 +189,7 @@ class GithubObject(object):
             else:
                 return datetime.datetime.strptime(s, "%Y-%m-%dT%H:%M:%SZ")
 
-        return GithubObject.__makeTransformedAttribute(
-            value, (str, six.text_type), parseDatetime
-        )
+        return GithubObject.__makeTransformedAttribute(value, str, parseDatetime)
 
     def _makeClassAttribute(self, klass, value):
         return GithubObject.__makeTransformedAttribute(
@@ -206,7 +200,7 @@ class GithubObject(object):
 
     @staticmethod
     def _makeListOfStringsAttribute(value):
-        return GithubObject.__makeSimpleListAttribute(value, (str, six.text_type))
+        return GithubObject.__makeSimpleListAttribute(value, str)
 
     @staticmethod
     def _makeListOfIntsAttribute(value):
@@ -235,8 +229,8 @@ class GithubObject(object):
 
     def _makeDictOfStringsToClassesAttribute(self, klass, value):
         if isinstance(value, dict) and all(
-            isinstance(key, (str, six.text_type)) and isinstance(element, dict)
-            for key, element in six.iteritems(value)
+            isinstance(key, str) and isinstance(element, dict)
+            for key, element in value.items()
         ):
             return _ValuedAttribute(
                 dict(
@@ -244,11 +238,11 @@ class GithubObject(object):
                         key,
                         klass(self._requester, self._headers, element, completed=False),
                     )
-                    for key, element in six.iteritems(value)
+                    for key, element in value.items()
                 )
             )
         else:
-            return _BadAttribute(value, {(str, six.text_type): dict})
+            return _BadAttribute(value, {str: dict})
 
     @property
     def etag(self):
@@ -274,13 +268,13 @@ class GithubObject(object):
             for k, v in sorted(items, key=itemgetter(0), reverse=True):
                 if isinstance(v, bytes):
                     v = v.decode("utf-8")
-                if isinstance(v, six.text_type):
-                    v = u'"{v}"'.format(v=v)
+                if isinstance(v, str):
+                    v = '"{v}"'.format(v=v)
                 yield u"{k}={v}".format(k=k, v=v)
 
-        return u"{class_name}({params})".format(
+        return "{class_name}({params})".format(
             class_name=self.__class__.__name__,
-            params=u", ".join(list(format_params(params))),
+            params=", ".join(list(format_params(params))),
         )
 
 
diff --git a/github/GitignoreTemplate.py b/github/GitignoreTemplate.py
index b3eaefe5..79c708be 100644
--- a/github/GitignoreTemplate.py
+++ b/github/GitignoreTemplate.py
@@ -29,8 +29,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.GithubObject
 
 
diff --git a/github/Hook.py b/github/Hook.py
index 423a6029..75c5473c 100644
--- a/github/Hook.py
+++ b/github/Hook.py
@@ -31,10 +31,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
-import six
-
 import github.GithubObject
 import github.HookResponse
 
@@ -161,16 +157,16 @@ class Hook(github.GithubObject.CompletableGithubObject):
         :param active: bool
         :rtype: None
         """
-        assert isinstance(name, (str, six.text_type)), name
+        assert isinstance(name, str), name
         assert isinstance(config, dict), config
         assert events is github.GithubObject.NotSet or all(
-            isinstance(element, (str, six.text_type)) for element in events
+            isinstance(element, str) for element in events
         ), events
         assert add_events is github.GithubObject.NotSet or all(
-            isinstance(element, (str, six.text_type)) for element in add_events
+            isinstance(element, str) for element in add_events
         ), add_events
         assert remove_events is github.GithubObject.NotSet or all(
-            isinstance(element, (str, six.text_type)) for element in remove_events
+            isinstance(element, str) for element in remove_events
         ), remove_events
         assert active is github.GithubObject.NotSet or isinstance(active, bool), active
         post_parameters = {
diff --git a/github/HookDescription.py b/github/HookDescription.py
index 6c23613f..6db95c7a 100644
--- a/github/HookDescription.py
+++ b/github/HookDescription.py
@@ -30,8 +30,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.GithubObject
 
 
diff --git a/github/HookResponse.py b/github/HookResponse.py
index 692700c1..72b02375 100644
--- a/github/HookResponse.py
+++ b/github/HookResponse.py
@@ -30,8 +30,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.GithubObject
 
 
diff --git a/github/InputFileContent.py b/github/InputFileContent.py
index 7c2f578b..1c2cc77d 100644
--- a/github/InputFileContent.py
+++ b/github/InputFileContent.py
@@ -28,10 +28,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
-import six
-
 import github.GithubObject
 
 
@@ -46,9 +42,9 @@ class InputFileContent(object):
         :param new_name: string
         """
 
-        assert isinstance(content, (str, six.text_type)), content
+        assert isinstance(content, str), content
         assert new_name is github.GithubObject.NotSet or isinstance(
-            new_name, (str, six.text_type)
+            new_name, str
         ), new_name
         self.__newName = new_name
         self.__content = content
diff --git a/github/InputGitAuthor.py b/github/InputGitAuthor.py
index 30676e05..17b54902 100644
--- a/github/InputGitAuthor.py
+++ b/github/InputGitAuthor.py
@@ -30,10 +30,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
-import six
-
 import github.GithubObject
 
 
@@ -49,10 +45,10 @@ class InputGitAuthor(object):
         :param date: string
         """
 
-        assert isinstance(name, (str, six.text_type)), name
-        assert isinstance(email, (str, six.text_type)), email
+        assert isinstance(name, str), name
+        assert isinstance(email, str), email
         assert date is github.GithubObject.NotSet or isinstance(
-            date, (str, six.text_type)
+            date, str
         ), date  # @todo Datetime?
 
         self.__name = name
diff --git a/github/InputGitTreeElement.py b/github/InputGitTreeElement.py
index b45de420..14da2745 100644
--- a/github/InputGitTreeElement.py
+++ b/github/InputGitTreeElement.py
@@ -28,10 +28,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
-import six
-
 import github.GithubObject
 
 
@@ -56,16 +52,16 @@ class InputGitTreeElement(object):
         :param sha: string or None
         """
 
-        assert isinstance(path, (str, six.text_type)), path
-        assert isinstance(mode, (str, six.text_type)), mode
-        assert isinstance(type, (str, six.text_type)), type
+        assert isinstance(path, str), path
+        assert isinstance(mode, str), mode
+        assert isinstance(type, str), type
         assert content is github.GithubObject.NotSet or isinstance(
-            content, (str, six.text_type)
+            content, str
         ), content
         assert (
             sha is github.GithubObject.NotSet
             or sha is None
-            or isinstance(sha, (str, six.text_type))
+            or isinstance(sha, str)
         ), sha
         self.__path = path
         self.__mode = mode
diff --git a/github/Installation.py b/github/Installation.py
index fd9e2839..b83049b9 100644
--- a/github/Installation.py
+++ b/github/Installation.py
@@ -25,8 +25,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.Authorization
 import github.Event
 import github.Gist
diff --git a/github/InstallationAuthorization.py b/github/InstallationAuthorization.py
index b552dbbc..addd2839 100644
--- a/github/InstallationAuthorization.py
+++ b/github/InstallationAuthorization.py
@@ -25,8 +25,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.GithubObject
 import github.NamedUser
 import github.PaginatedList
diff --git a/github/Invitation.py b/github/Invitation.py
index 0f5269de..5f7f0c01 100644
--- a/github/Invitation.py
+++ b/github/Invitation.py
@@ -24,8 +24,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.GithubObject
 
 
diff --git a/github/Issue.py b/github/Issue.py
index bfbdbba4..63266db5 100644
--- a/github/Issue.py
+++ b/github/Issue.py
@@ -43,12 +43,8 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import datetime
-
-import six
-import six.moves.urllib.parse
+import urllib.parse
 
 import github.GithubObject
 import github.IssueComment
@@ -294,7 +290,7 @@ class Issue(github.GithubObject.CompletableGithubObject):
         :rtype: None
         """
         assert all(
-            isinstance(element, (github.NamedUser.NamedUser, str, six.text_type))
+            isinstance(element, (github.NamedUser.NamedUser, str))
             for element in assignees
         ), assignees
         post_parameters = {
@@ -317,8 +313,7 @@ class Issue(github.GithubObject.CompletableGithubObject):
         :rtype: None
         """
         assert all(
-            isinstance(element, (github.Label.Label, str, six.text_type))
-            for element in labels
+            isinstance(element, (github.Label.Label, str)) for element in labels
         ), labels
         post_parameters = [
             label.name if isinstance(label, github.Label.Label) else label
@@ -334,7 +329,7 @@ class Issue(github.GithubObject.CompletableGithubObject):
         :param body: string
         :rtype: :class:`github.IssueComment.IssueComment`
         """
-        assert isinstance(body, (str, six.text_type)), body
+        assert isinstance(body, str), body
         post_parameters = {
             "body": body,
         }
@@ -375,33 +370,26 @@ class Issue(github.GithubObject.CompletableGithubObject):
         :param labels: list of string
         :rtype: None
         """
-        assert title is github.GithubObject.NotSet or isinstance(
-            title, (str, six.text_type)
-        ), title
-        assert body is github.GithubObject.NotSet or isinstance(
-            body, (str, six.text_type)
-        ), body
+        assert title is github.GithubObject.NotSet or isinstance(title, str), title
+        assert body is github.GithubObject.NotSet or isinstance(body, str), body
         assert (
             assignee is github.GithubObject.NotSet
             or assignee is None
             or isinstance(assignee, github.NamedUser.NamedUser)
-            or isinstance(assignee, (str, six.text_type))
+            or isinstance(assignee, str)
         ), assignee
         assert assignees is github.GithubObject.NotSet or all(
-            isinstance(element, github.NamedUser.NamedUser)
-            or isinstance(element, (str, six.text_type))
+            isinstance(element, github.NamedUser.NamedUser) or isinstance(element, str)
             for element in assignees
         ), assignees
-        assert state is github.GithubObject.NotSet or isinstance(
-            state, (str, six.text_type)
-        ), state
+        assert state is github.GithubObject.NotSet or isinstance(state, str), state
         assert (
             milestone is github.GithubObject.NotSet
             or milestone is None
             or isinstance(milestone, github.Milestone.Milestone)
         ), milestone
         assert labels is github.GithubObject.NotSet or all(
-            isinstance(element, (str, six.text_type)) for element in labels
+            isinstance(element, str) for element in labels
         ), labels
         post_parameters = dict()
         if title is not github.GithubObject.NotSet:
@@ -409,7 +397,7 @@ class Issue(github.GithubObject.CompletableGithubObject):
         if body is not github.GithubObject.NotSet:
             post_parameters["body"] = body
         if assignee is not github.GithubObject.NotSet:
-            if isinstance(assignee, (str, six.text_type)):
+            if isinstance(assignee, str):
                 post_parameters["assignee"] = assignee
             else:
                 post_parameters["assignee"] = assignee._identity if assignee else ""
@@ -437,7 +425,7 @@ class Issue(github.GithubObject.CompletableGithubObject):
         :param lock_reason: string
         :rtype: None
         """
-        assert isinstance(lock_reason, (str, six.text_type)), lock_reason
+        assert isinstance(lock_reason, str), lock_reason
         put_parameters = dict()
         put_parameters["lock_reason"] = lock_reason
         headers, data = self._requester.requestJsonAndCheck(
@@ -462,7 +450,7 @@ class Issue(github.GithubObject.CompletableGithubObject):
         :param id: integer
         :rtype: :class:`github.IssueComment.IssueComment`
         """
-        assert isinstance(id, six.integer_types), id
+        assert isinstance(id, int), id
         headers, data = self._requester.requestJsonAndCheck(
             "GET", self._parentUrl(self.url) + "/comments/" + str(id)
         )
@@ -518,7 +506,7 @@ class Issue(github.GithubObject.CompletableGithubObject):
         :rtype: None
         """
         assert all(
-            isinstance(element, (github.NamedUser.NamedUser, str, six.text_type))
+            isinstance(element, (github.NamedUser.NamedUser, str))
             for element in assignees
         ), assignees
         post_parameters = {
@@ -540,11 +528,11 @@ class Issue(github.GithubObject.CompletableGithubObject):
         :param label: :class:`github.Label.Label` or string
         :rtype: None
         """
-        assert isinstance(label, (github.Label.Label, str, six.text_type)), label
+        assert isinstance(label, (github.Label.Label, str)), label
         if isinstance(label, github.Label.Label):
             label = label._identity
         else:
-            label = six.moves.urllib.parse.quote(label)
+            label = urllib.parse.quote(label)
         headers, data = self._requester.requestJsonAndCheck(
             "DELETE", self.url + "/labels/" + label
         )
@@ -556,8 +544,7 @@ class Issue(github.GithubObject.CompletableGithubObject):
         :rtype: None
         """
         assert all(
-            isinstance(element, (github.Label.Label, str, six.text_type))
-            for element in labels
+            isinstance(element, (github.Label.Label, str)) for element in labels
         ), labels
         post_parameters = [
             label.name if isinstance(label, github.Label.Label) else label
@@ -586,9 +573,7 @@ class Issue(github.GithubObject.CompletableGithubObject):
         :param reaction_type: string
         :rtype: :class:`github.Reaction.Reaction`
         """
-        assert isinstance(
-            reaction_type, (str, six.text_type)
-        ), "reaction type should be a string"
+        assert isinstance(reaction_type, str), "reaction type should be a string"
         assert reaction_type in [
             "+1",
             "-1",
diff --git a/github/IssueComment.py b/github/IssueComment.py
index e25f48f9..ab2b5038 100644
--- a/github/IssueComment.py
+++ b/github/IssueComment.py
@@ -33,10 +33,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
-import six
-
 import github.GithubObject
 import github.NamedUser
 
@@ -128,7 +124,7 @@ class IssueComment(github.GithubObject.CompletableGithubObject):
         :param body: string
         :rtype: None
         """
-        assert isinstance(body, (str, six.text_type)), body
+        assert isinstance(body, str), body
         post_parameters = {
             "body": body,
         }
@@ -158,9 +154,7 @@ class IssueComment(github.GithubObject.CompletableGithubObject):
         :param reaction_type: string
         :rtype: :class:`github.Reaction.Reaction`
         """
-        assert isinstance(
-            reaction_type, (str, six.text_type)
-        ), "reaction type should be a string"
+        assert isinstance(reaction_type, str), "reaction type should be a string"
         assert reaction_type in [
             "+1",
             "-1",
diff --git a/github/IssueEvent.py b/github/IssueEvent.py
index f7da5b69..250a87c0 100644
--- a/github/IssueEvent.py
+++ b/github/IssueEvent.py
@@ -31,8 +31,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.GithubObject
 import github.Issue
 import github.NamedUser
diff --git a/github/IssuePullRequest.py b/github/IssuePullRequest.py
index 9ee61f9d..f35f4da0 100644
--- a/github/IssuePullRequest.py
+++ b/github/IssuePullRequest.py
@@ -29,8 +29,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.GithubObject
 
 
diff --git a/github/Label.py b/github/Label.py
index b48d1f74..02c6486c 100644
--- a/github/Label.py
+++ b/github/Label.py
@@ -31,10 +31,7 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
-import six
-import six.moves.urllib.parse
+import urllib.parse
 
 import github.GithubObject
 
@@ -96,10 +93,10 @@ class Label(github.GithubObject.CompletableGithubObject):
         :param description: string
         :rtype: None
         """
-        assert isinstance(name, (str, six.text_type)), name
-        assert isinstance(color, (str, six.text_type)), color
+        assert isinstance(name, str), name
+        assert isinstance(color, str), color
         assert description is github.GithubObject.NotSet or isinstance(
-            description, (str, six.text_type)
+            description, str
         ), description
         post_parameters = {
             "name": name,
@@ -117,7 +114,7 @@ class Label(github.GithubObject.CompletableGithubObject):
 
     @property
     def _identity(self):
-        return six.moves.urllib.parse.quote(self.name)
+        return urllib.parse.quote(self.name)
 
     def _initAttributes(self):
         self._color = github.GithubObject.NotSet
diff --git a/github/License.py b/github/License.py
index dd5414db..f9ed8843 100644
--- a/github/License.py
+++ b/github/License.py
@@ -22,8 +22,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.GithubObject
 
 
diff --git a/github/MainClass.py b/github/MainClass.py
index e775916e..829a7e44 100644
--- a/github/MainClass.py
+++ b/github/MainClass.py
@@ -48,15 +48,12 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import datetime
 import pickle
 import time
 
 import jwt
 import requests
-import six
 import urllib3
 
 import github.Gist
@@ -120,22 +117,14 @@ class Github(object):
         :param retry: int or urllib3.util.retry.Retry object
         """
 
-        assert login_or_token is None or isinstance(
-            login_or_token, (str, six.text_type)
-        ), login_or_token
-        assert password is None or isinstance(password, (str, six.text_type)), password
-        assert jwt is None or isinstance(jwt, (str, six.text_type)), jwt
-        assert isinstance(base_url, (str, six.text_type)), base_url
-        assert isinstance(timeout, six.integer_types), timeout
-        assert client_id is None or isinstance(
-            client_id, (str, six.text_type)
-        ), client_id
-        assert client_secret is None or isinstance(
-            client_secret, (str, six.text_type)
-        ), client_secret
-        assert user_agent is None or isinstance(
-            user_agent, (str, six.text_type)
-        ), user_agent
+        assert login_or_token is None or isinstance(login_or_token, str), login_or_token
+        assert password is None or isinstance(password, str), password
+        assert jwt is None or isinstance(jwt, str), jwt
+        assert isinstance(base_url, str), base_url
+        assert isinstance(timeout, int), timeout
+        assert client_id is None or isinstance(client_id, str), client_id
+        assert client_secret is None or isinstance(client_secret, str), client_secret
+        assert user_agent is None or isinstance(user_agent, str), user_agent
         assert (
             retry is None
             or isinstance(retry, (int))
@@ -230,7 +219,7 @@ class Github(object):
         :rtype: :class:`github.License.License`
         """
 
-        assert isinstance(key, (str, six.text_type)), key
+        assert isinstance(key, str), key
         headers, data = self.__requester.requestJsonAndCheck("GET", "/licenses/" + key)
         return github.License.License(self.__requester, headers, data, completed=True)
 
@@ -252,9 +241,7 @@ class Github(object):
         :param login: string
         :rtype: :class:`github.NamedUser.NamedUser`
         """
-        assert login is github.GithubObject.NotSet or isinstance(
-            login, (str, six.text_type)
-        ), login
+        assert login is github.GithubObject.NotSet or isinstance(login, str), login
         if login is github.GithubObject.NotSet:
             return AuthenticatedUser.AuthenticatedUser(
                 self.__requester, {}, {"url": "/user"}, completed=False
@@ -273,9 +260,7 @@ class Github(object):
         :param since: integer
         :rtype: :class:`github.PaginatedList.PaginatedList` of :class:`github.NamedUser.NamedUser`
         """
-        assert since is github.GithubObject.NotSet or isinstance(
-            since, six.integer_types
-        ), since
+        assert since is github.GithubObject.NotSet or isinstance(since, int), since
         url_parameters = dict()
         if since is not github.GithubObject.NotSet:
             url_parameters["since"] = since
@@ -289,7 +274,7 @@ class Github(object):
         :param login: string
         :rtype: :class:`github.Organization.Organization`
         """
-        assert isinstance(login, (str, six.text_type)), login
+        assert isinstance(login, str), login
         headers, data = self.__requester.requestJsonAndCheck("GET", "/orgs/" + login)
         return github.Organization.Organization(
             self.__requester, headers, data, completed=True
@@ -301,9 +286,7 @@ class Github(object):
         :param since: integer
         :rtype: :class:`github.PaginatedList.PaginatedList` of :class:`github.Organization.Organization`
         """
-        assert since is github.GithubObject.NotSet or isinstance(
-            since, six.integer_types
-        ), since
+        assert since is github.GithubObject.NotSet or isinstance(since, int), since
         url_parameters = dict()
         if since is not github.GithubObject.NotSet:
             url_parameters["since"] = since
@@ -319,7 +302,7 @@ class Github(object):
         :calls: `GET /repos/:owner/:repo <http://developer.github.com/v3/repos>`_ or `GET /repositories/:id <http://developer.github.com/v3/repos>`_
         :rtype: :class:`github.Repository.Repository`
         """
-        assert isinstance(full_name_or_id, (str, six.text_type, int)), full_name_or_id
+        assert isinstance(full_name_or_id, (str, int)), full_name_or_id
         url_base = "/repositories/" if isinstance(full_name_or_id, int) else "/repos/"
         url = "%s%s" % (url_base, full_name_or_id)
         if lazy:
@@ -340,9 +323,7 @@ class Github(object):
         :param visibility: string ('all','public')
         :rtype: :class:`github.PaginatedList.PaginatedList` of :class:`github.Repository.Repository`
         """
-        assert since is github.GithubObject.NotSet or isinstance(
-            since, six.integer_types
-        ), since
+        assert since is github.GithubObject.NotSet or isinstance(since, int), since
         url_parameters = dict()
         if since is not github.GithubObject.NotSet:
             url_parameters["since"] = since
@@ -375,7 +356,7 @@ class Github(object):
         :param id: string
         :rtype: :class:`github.Gist.Gist`
         """
-        assert isinstance(id, (str, six.text_type)), id
+        assert isinstance(id, str), id
         headers, data = self.__requester.requestJsonAndCheck("GET", "/gists/" + id)
         return github.Gist.Gist(self.__requester, headers, data, completed=True)
 
@@ -410,7 +391,7 @@ class Github(object):
         :param qualifiers: keyword dict query qualifiers
         :rtype: :class:`github.PaginatedList.PaginatedList` of :class:`github.Repository.Repository`
         """
-        assert isinstance(query, (str, six.text_type)), query
+        assert isinstance(query, str), query
         url_parameters = dict()
         if (
             sort is not github.GithubObject.NotSet
@@ -455,7 +436,7 @@ class Github(object):
         :param qualifiers: keyword dict query qualifiers
         :rtype: :class:`github.PaginatedList.PaginatedList` of :class:`github.NamedUser.NamedUser`
         """
-        assert isinstance(query, (str, six.text_type)), query
+        assert isinstance(query, str), query
         url_parameters = dict()
         if sort is not github.GithubObject.NotSet:
             assert sort in ("followers", "repositories", "joined"), sort
@@ -496,7 +477,7 @@ class Github(object):
         :param qualifiers: keyword dict query qualifiers
         :rtype: :class:`github.PaginatedList.PaginatedList` of :class:`github.Issue.Issue`
         """
-        assert isinstance(query, (str, six.text_type)), query
+        assert isinstance(query, str), query
         url_parameters = dict()
         if sort is not github.GithubObject.NotSet:
             assert sort in ("comments", "created", "updated"), sort
@@ -536,7 +517,7 @@ class Github(object):
         :param qualifiers: keyword dict query qualifiers
         :rtype: :class:`github.PaginatedList.PaginatedList` of :class:`github.ContentFile.ContentFile`
         """
-        assert isinstance(query, (str, six.text_type)), query
+        assert isinstance(query, str), query
         url_parameters = dict()
         if (
             sort is not github.GithubObject.NotSet
@@ -584,7 +565,7 @@ class Github(object):
         :param qualifiers: keyword dict query qualifiers
         :rtype: :class:`github.PaginatedList.PaginatedList` of :class:`github.Commit.Commit`
         """
-        assert isinstance(query, (str, six.text_type)), query
+        assert isinstance(query, str), query
         url_parameters = dict()
         if (
             sort is not github.GithubObject.NotSet
@@ -622,7 +603,7 @@ class Github(object):
         :param qualifiers: keyword dict query qualifiers
         :rtype: :class:`github.PaginatedList.PaginatedList` of :class:`github.Topic.Topic`
         """
-        assert isinstance(query, (str, six.text_type)), query
+        assert isinstance(query, str), query
         url_parameters = dict()
 
         query_chunks = []
@@ -650,7 +631,7 @@ class Github(object):
         :param context: :class:`github.Repository.Repository`
         :rtype: string
         """
-        assert isinstance(text, (str, six.text_type)), text
+        assert isinstance(text, str), text
         assert context is github.GithubObject.NotSet or isinstance(
             context, github.Repository.Repository
         ), context
@@ -669,7 +650,7 @@ class Github(object):
         :param name: string
         :rtype: :class:`github.HookDescription.HookDescription`
         """
-        assert isinstance(name, (str, six.text_type)), name
+        assert isinstance(name, str), name
         headers, attributes = self.__requester.requestJsonAndCheck(
             "GET", "/hooks/" + name
         )
@@ -705,7 +686,7 @@ class Github(object):
         :calls: `GET /gitignore/templates/:name <http://developer.github.com/v3/gitignore>`_
         :rtype: :class:`github.GitignoreTemplate.GitignoreTemplate`
         """
-        assert isinstance(name, (str, six.text_type)), name
+        assert isinstance(name, str), name
         headers, attributes = self.__requester.requestJsonAndCheck(
             "GET", "/gitignore/templates/" + name
         )
@@ -779,7 +760,7 @@ class GithubIntegration(object):
         self.base_url = base_url
         self.integration_id = integration_id
         self.private_key = private_key
-        assert isinstance(base_url, (str, six.text_type)), base_url
+        assert isinstance(base_url, str), base_url
 
     def create_jwt(self, expiration=60):
         """
diff --git a/github/Migration.py b/github/Migration.py
index 4365775f..94ae9110 100644
--- a/github/Migration.py
+++ b/github/Migration.py
@@ -32,10 +32,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
-import six
-
 import github.GithubObject
 import github.NamedUser
 import github.PaginatedList
@@ -171,7 +167,7 @@ class Migration(github.GithubObject.CompletableGithubObject):
         :param repo_name: str
         :rtype: None
         """
-        assert isinstance(repo_name, (str, six.text_type)), repo_name
+        assert isinstance(repo_name, str), repo_name
         headers, data = self._requester.requestJsonAndCheck(
             "DELETE",
             self.url + "/repos/" + repo_name + "/lock",
diff --git a/github/Milestone.py b/github/Milestone.py
index 647aedf4..4362a47c 100644
--- a/github/Milestone.py
+++ b/github/Milestone.py
@@ -30,12 +30,8 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import datetime
 
-import six
-
 import github.GithubObject
 import github.Label
 import github.NamedUser
@@ -178,12 +174,10 @@ class Milestone(github.GithubObject.CompletableGithubObject):
         :param due_on: date
         :rtype: None
         """
-        assert isinstance(title, (str, six.text_type)), title
-        assert state is github.GithubObject.NotSet or isinstance(
-            state, (str, six.text_type)
-        ), state
+        assert isinstance(title, str), title
+        assert state is github.GithubObject.NotSet or isinstance(state, str), state
         assert description is github.GithubObject.NotSet or isinstance(
-            description, (str, six.text_type)
+            description, str
         ), description
         assert due_on is github.GithubObject.NotSet or isinstance(
             due_on, datetime.date
diff --git a/github/NamedUser.py b/github/NamedUser.py
index 686dd09a..d1ad8cf5 100644
--- a/github/NamedUser.py
+++ b/github/NamedUser.py
@@ -37,12 +37,8 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import datetime
 
-import six
-
 import github.Event
 import github.Gist
 import github.GithubObject
@@ -521,7 +517,7 @@ class NamedUser(github.GithubObject.CompletableGithubObject):
         :param name: string
         :rtype: :class:`github.Repository.Repository`
         """
-        assert isinstance(name, (str, six.text_type)), name
+        assert isinstance(name, str), name
         headers, data = self._requester.requestJsonAndCheck(
             "GET", "/repos/" + self.login + "/" + name
         )
@@ -542,14 +538,10 @@ class NamedUser(github.GithubObject.CompletableGithubObject):
         :param direction: string
         :rtype: :class:`github.PaginatedList.PaginatedList` of :class:`github.Repository.Repository`
         """
-        assert type is github.GithubObject.NotSet or isinstance(
-            type, (str, six.text_type)
-        ), type
-        assert sort is github.GithubObject.NotSet or isinstance(
-            sort, (str, six.text_type)
-        ), sort
+        assert type is github.GithubObject.NotSet or isinstance(type, str), type
+        assert sort is github.GithubObject.NotSet or isinstance(sort, str), sort
         assert direction is github.GithubObject.NotSet or isinstance(
-            direction, (str, six.text_type)
+            direction, str
         ), direction
         url_parameters = dict()
         if type is not github.GithubObject.NotSet:
@@ -617,7 +609,7 @@ class NamedUser(github.GithubObject.CompletableGithubObject):
         :param org: string or :class:`github.Organization.Organization`
         :rtype: :class:`github.Membership.Membership`
         """
-        assert isinstance(org, (str, six.text_type)) or isinstance(
+        assert isinstance(org, str) or isinstance(
             org, github.Organization.Organization
         ), org
         if isinstance(org, github.Organization.Organization):
diff --git a/github/Notification.py b/github/Notification.py
index 74efbf2f..174d59c2 100644
--- a/github/Notification.py
+++ b/github/Notification.py
@@ -29,8 +29,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.GithubObject
 import github.NotificationSubject
 import github.Repository
diff --git a/github/NotificationSubject.py b/github/NotificationSubject.py
index d97c256e..83bee7d3 100644
--- a/github/NotificationSubject.py
+++ b/github/NotificationSubject.py
@@ -28,8 +28,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.GithubObject
 
 
diff --git a/github/Organization.py b/github/Organization.py
index 6ff06102..eb4439bd 100644
--- a/github/Organization.py
+++ b/github/Organization.py
@@ -41,12 +41,8 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import datetime
 
-import six
-
 import github.Event
 import github.GithubObject
 import github.NamedUser
@@ -322,9 +318,7 @@ class Organization(github.GithubObject.CompletableGithubObject):
         :param role: string
         :rtype: None
         """
-        assert role is github.GithubObject.NotSet or isinstance(
-            role, (str, six.text_type)
-        ), role
+        assert role is github.GithubObject.NotSet or isinstance(role, str), role
         assert isinstance(member, github.NamedUser.NamedUser), member
         put_parameters = {}
         if role is not github.GithubObject.NotSet:
@@ -378,10 +372,10 @@ class Organization(github.GithubObject.CompletableGithubObject):
         :param active: bool
         :rtype: :class:`github.Hook.Hook`
         """
-        assert isinstance(name, (str, six.text_type)), name
+        assert isinstance(name, str), name
         assert isinstance(config, dict), config
         assert events is github.GithubObject.NotSet or all(
-            isinstance(element, (str, six.text_type)) for element in events
+            isinstance(element, str) for element in events
         ), events
         assert active is github.GithubObject.NotSet or isinstance(active, bool), active
         post_parameters = {
@@ -434,12 +428,12 @@ class Organization(github.GithubObject.CompletableGithubObject):
         :param allow_rebase_merge: bool
         :rtype: :class:`github.Repository.Repository`
         """
-        assert isinstance(name, (str, six.text_type)), name
+        assert isinstance(name, str), name
         assert description is github.GithubObject.NotSet or isinstance(
-            description, (str, six.text_type)
+            description, str
         ), description
         assert homepage is github.GithubObject.NotSet or isinstance(
-            homepage, (str, six.text_type)
+            homepage, str
         ), homepage
         assert private is github.GithubObject.NotSet or isinstance(
             private, bool
@@ -457,16 +451,16 @@ class Organization(github.GithubObject.CompletableGithubObject):
             has_projects, bool
         ), has_projects
         assert team_id is github.GithubObject.NotSet or isinstance(
-            team_id, six.integer_types
+            team_id, int
         ), team_id
         assert auto_init is github.GithubObject.NotSet or isinstance(
             auto_init, bool
         ), auto_init
         assert license_template is github.GithubObject.NotSet or isinstance(
-            license_template, (str, six.text_type)
+            license_template, str
         ), license_template
         assert gitignore_template is github.GithubObject.NotSet or isinstance(
-            gitignore_template, (str, six.text_type)
+            gitignore_template, str
         ), gitignore_template
         assert allow_squash_merge is github.GithubObject.NotSet or isinstance(
             allow_squash_merge, bool
@@ -532,18 +526,18 @@ class Organization(github.GithubObject.CompletableGithubObject):
         :param description: string
         :rtype: :class:`github.Team.Team`
         """
-        assert isinstance(name, (str, six.text_type)), name
+        assert isinstance(name, str), name
         assert repo_names is github.GithubObject.NotSet or all(
             isinstance(element, github.Repository.Repository) for element in repo_names
         ), repo_names
         assert permission is github.GithubObject.NotSet or isinstance(
-            permission, (str, six.text_type)
+            permission, str
         ), permission
         assert privacy is github.GithubObject.NotSet or isinstance(
-            privacy, (str, six.text_type)
+            privacy, str
         ), privacy
         assert description is github.GithubObject.NotSet or isinstance(
-            description, (str, six.text_type)
+            description, str
         ), description
         post_parameters = {
             "name": name,
@@ -569,7 +563,7 @@ class Organization(github.GithubObject.CompletableGithubObject):
         :param id: integer
         :rtype: None`
         """
-        assert isinstance(id, six.integer_types), id
+        assert isinstance(id, int), id
         headers, data = self._requester.requestJsonAndCheck(
             "DELETE", self.url + "/hooks/" + str(id)
         )
@@ -596,26 +590,20 @@ class Organization(github.GithubObject.CompletableGithubObject):
         :rtype: None
         """
         assert billing_email is github.GithubObject.NotSet or isinstance(
-            billing_email, (str, six.text_type)
+            billing_email, str
         ), billing_email
-        assert blog is github.GithubObject.NotSet or isinstance(
-            blog, (str, six.text_type)
-        ), blog
+        assert blog is github.GithubObject.NotSet or isinstance(blog, str), blog
         assert company is github.GithubObject.NotSet or isinstance(
-            company, (str, six.text_type)
+            company, str
         ), company
         assert description is github.GithubObject.NotSet or isinstance(
-            description, (str, six.text_type)
+            description, str
         ), description
-        assert email is github.GithubObject.NotSet or isinstance(
-            email, (str, six.text_type)
-        ), email
+        assert email is github.GithubObject.NotSet or isinstance(email, str), email
         assert location is github.GithubObject.NotSet or isinstance(
-            location, (str, six.text_type)
+            location, str
         ), location
-        assert name is github.GithubObject.NotSet or isinstance(
-            name, (str, six.text_type)
-        ), name
+        assert name is github.GithubObject.NotSet or isinstance(name, str), name
         post_parameters = dict()
         if billing_email is not github.GithubObject.NotSet:
             post_parameters["billing_email"] = billing_email
@@ -653,11 +641,11 @@ class Organization(github.GithubObject.CompletableGithubObject):
         :param active: bool
         :rtype: :class:`github.Hook.Hook`
         """
-        assert isinstance(id, six.integer_types), id
-        assert isinstance(name, (str, six.text_type)), name
+        assert isinstance(id, int), id
+        assert isinstance(name, str), name
         assert isinstance(config, dict), config
         assert events is github.GithubObject.NotSet or all(
-            isinstance(element, (str, six.text_type)) for element in events
+            isinstance(element, str) for element in events
         ), events
         assert active is github.GithubObject.NotSet or isinstance(active, bool), active
         post_parameters = {
@@ -688,7 +676,7 @@ class Organization(github.GithubObject.CompletableGithubObject):
         :param id: integer
         :rtype: :class:`github.Hook.Hook`
         """
-        assert isinstance(id, six.integer_types), id
+        assert isinstance(id, int), id
         headers, data = self._requester.requestJsonAndCheck(
             "GET", self.url + "/hooks/" + str(id)
         )
@@ -723,20 +711,14 @@ class Organization(github.GithubObject.CompletableGithubObject):
         :param since: datetime.datetime
         :rtype: :class:`github.PaginatedList.PaginatedList` of :class:`github.Issue.Issue`
         """
-        assert filter is github.GithubObject.NotSet or isinstance(
-            filter, (str, six.text_type)
-        ), filter
-        assert state is github.GithubObject.NotSet or isinstance(
-            state, (str, six.text_type)
-        ), state
+        assert filter is github.GithubObject.NotSet or isinstance(filter, str), filter
+        assert state is github.GithubObject.NotSet or isinstance(state, str), state
         assert labels is github.GithubObject.NotSet or all(
             isinstance(element, github.Label.Label) for element in labels
         ), labels
-        assert sort is github.GithubObject.NotSet or isinstance(
-            sort, (str, six.text_type)
-        ), sort
+        assert sort is github.GithubObject.NotSet or isinstance(sort, str), sort
         assert direction is github.GithubObject.NotSet or isinstance(
-            direction, (str, six.text_type)
+            direction, str
         ), direction
         assert since is github.GithubObject.NotSet or isinstance(
             since, datetime.datetime
@@ -768,11 +750,9 @@ class Organization(github.GithubObject.CompletableGithubObject):
         :rtype: :class:`github.PaginatedList.PaginatedList` of :class:`github.NamedUser.NamedUser`
         """
         assert filter_ is github.GithubObject.NotSet or isinstance(
-            filter_, (str, six.text_type)
+            filter_, str
         ), filter_
-        assert role is github.GithubObject.NotSet or isinstance(
-            role, (str, six.text_type)
-        ), role
+        assert role is github.GithubObject.NotSet or isinstance(role, str), role
 
         url_parameters = {}
         if filter_ is not github.GithubObject.NotSet:
@@ -824,7 +804,7 @@ class Organization(github.GithubObject.CompletableGithubObject):
         :rtype: :class:`github.PaginatedList.PaginatedList` of :class:`github.NamedUser.NamedUser`
         """
         assert filter_ is github.GithubObject.NotSet or isinstance(
-            filter_, (str, six.text_type)
+            filter_, str
         ), filter_
 
         url_parameters = {}
@@ -865,7 +845,7 @@ class Organization(github.GithubObject.CompletableGithubObject):
         :param name: string
         :rtype: :class:`github.Repository.Repository`
         """
-        assert isinstance(name, (str, six.text_type)), name
+        assert isinstance(name, str), name
         headers, data = self._requester.requestJsonAndCheck(
             "GET", "/repos/" + self.login + "/" + name
         )
@@ -886,14 +866,10 @@ class Organization(github.GithubObject.CompletableGithubObject):
         :param direction: string ('asc', desc')
         :rtype: :class:`github.PaginatedList.PaginatedList` of :class:`github.Repository.Repository`
         """
-        assert type is github.GithubObject.NotSet or isinstance(
-            type, (str, six.text_type)
-        ), type
-        assert sort is github.GithubObject.NotSet or isinstance(
-            sort, (str, six.text_type)
-        ), sort
+        assert type is github.GithubObject.NotSet or isinstance(type, str), type
+        assert sort is github.GithubObject.NotSet or isinstance(sort, str), sort
         assert direction is github.GithubObject.NotSet or isinstance(
-            direction, (str, six.text_type)
+            direction, str
         ), direction
 
         url_parameters = dict()
@@ -916,7 +892,7 @@ class Organization(github.GithubObject.CompletableGithubObject):
         :param id: integer
         :rtype: :class:`github.Team.Team`
         """
-        assert isinstance(id, six.integer_types), id
+        assert isinstance(id, int), id
         headers, data = self._requester.requestJsonAndCheck("GET", "/teams/" + str(id))
         return github.Team.Team(self._requester, headers, data, completed=True)
 
@@ -926,7 +902,7 @@ class Organization(github.GithubObject.CompletableGithubObject):
         :param slug: string
         :rtype: :class:`github.Team.Team`
         """
-        assert isinstance(slug, (str, six.text_type)), slug
+        assert isinstance(slug, str), slug
         headers, data = self._requester.requestJsonAndCheck(
             "GET", self.url + "/teams/" + slug
         )
@@ -972,9 +948,7 @@ class Organization(github.GithubObject.CompletableGithubObject):
         assert user is github.GithubObject.NotSet or isinstance(
             user, github.NamedUser.NamedUser
         ), user
-        assert email is github.GithubObject.NotSet or isinstance(
-            email, (str, six.text_type)
-        ), email
+        assert email is github.GithubObject.NotSet or isinstance(email, str), email
         assert (email is github.GithubObject.NotSet) ^ (
             user is github.GithubObject.NotSet
         ), "specify only one of email or user"
@@ -984,7 +958,7 @@ class Organization(github.GithubObject.CompletableGithubObject):
         elif email is not github.GithubObject.NotSet:
             parameters["email"] = email
         if role is not github.GithubObject.NotSet:
-            assert isinstance(role, (str, six.text_type)), role
+            assert isinstance(role, str), role
             assert role in ["admin", "direct_member", "billing_manager"]
             parameters["role"] = role
         if teams is not github.GithubObject.NotSet:
@@ -1072,7 +1046,7 @@ class Organization(github.GithubObject.CompletableGithubObject):
         :rtype: :class:`github.Migration.Migration`
         """
         assert isinstance(repos, (list, tuple)), repos
-        assert all(isinstance(repo, (str, six.text_type)) for repo in repos), repos
+        assert all(isinstance(repo, str) for repo in repos), repos
         assert lock_repositories is github.GithubObject.NotSet or isinstance(
             lock_repositories, bool
         ), lock_repositories
diff --git a/github/PaginatedList.py b/github/PaginatedList.py
index c6cf41a0..b6327444 100644
--- a/github/PaginatedList.py
+++ b/github/PaginatedList.py
@@ -37,10 +37,7 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
-import six
-from six.moves.urllib.parse import parse_qs
+from urllib.parse import parse_qs
 
 
 class PaginatedListBase:
@@ -49,7 +46,7 @@ class PaginatedListBase:
 
     def __getitem__(self, index):
         assert isinstance(index, (int, slice))
-        if isinstance(index, six.integer_types):
+        if isinstance(index, int):
             self.__fetchToIndex(index)
             return self.__elements[index]
         else:
diff --git a/github/Path.py b/github/Path.py
index 8df76115..7b2102b8 100644
--- a/github/Path.py
+++ b/github/Path.py
@@ -26,8 +26,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.GithubObject
 
 
diff --git a/github/Permissions.py b/github/Permissions.py
index 84084796..95b13c85 100644
--- a/github/Permissions.py
+++ b/github/Permissions.py
@@ -30,8 +30,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.GithubObject
 
 
diff --git a/github/Plan.py b/github/Plan.py
index 3ab504b1..a740afbb 100644
--- a/github/Plan.py
+++ b/github/Plan.py
@@ -30,8 +30,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.GithubObject
 
 
diff --git a/github/Project.py b/github/Project.py
index 9bc4ec01..a7e8062c 100644
--- a/github/Project.py
+++ b/github/Project.py
@@ -22,10 +22,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
-import six
-
 import github.GithubObject
 import github.ProjectColumn
 
@@ -163,7 +159,7 @@ class Project(github.GithubObject.CompletableGithubObject):
         calls: `POST https://developer.github.com/v3/projects/columns/#create-a-project-column>`_
         :param name: string
         """
-        assert isinstance(name, (str, six.text_type)), name
+        assert isinstance(name, str), name
         post_parameters = {"name": name}
         import_header = {"Accept": Consts.mediaTypeProjectsPreview}
         headers, data = self._requester.requestJsonAndCheck(
diff --git a/github/ProjectCard.py b/github/ProjectCard.py
index 2715ce9b..13dff57d 100644
--- a/github/ProjectCard.py
+++ b/github/ProjectCard.py
@@ -22,8 +22,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.GithubObject
 
 # NOTE: There is currently no way to get cards "in triage" for a project.
diff --git a/github/ProjectColumn.py b/github/ProjectColumn.py
index 7301508d..244a3184 100644
--- a/github/ProjectColumn.py
+++ b/github/ProjectColumn.py
@@ -22,10 +22,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
-import six
-
 import github.GithubObject
 import github.Project
 import github.ProjectCard
@@ -104,7 +100,7 @@ class ProjectColumn(github.GithubObject.CompletableGithubObject):
         :param archived_state: string
         """
         assert archived_state is github.GithubObject.NotSet or isinstance(
-            archived_state, (str, six.text_type)
+            archived_state, str
         ), archived_state
 
         url_parameters = dict()
@@ -132,14 +128,14 @@ class ProjectColumn(github.GithubObject.CompletableGithubObject):
         :param content_type: string
         """
         post_parameters = {}
-        if isinstance(note, (str, six.text_type)):
+        if isinstance(note, str):
             assert content_id is github.GithubObject.NotSet, content_id
             assert content_type is github.GithubObject.NotSet, content_type
             post_parameters = {"note": note}
         else:
             assert note is github.GithubObject.NotSet, note
             assert isinstance(content_id, int), content_id
-            assert isinstance(content_type, (str, six.text_type)), content_type
+            assert isinstance(content_type, str), content_type
             post_parameters = {"content_id": content_id, "content_type": content_type}
 
         import_header = {"Accept": Consts.mediaTypeProjectsPreview}
diff --git a/github/PullRequest.py b/github/PullRequest.py
index b7b97ac1..62c1a4bf 100644
--- a/github/PullRequest.py
+++ b/github/PullRequest.py
@@ -42,12 +42,8 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import datetime
-
-import six
-import six.moves.urllib.parse
+import urllib.parse
 
 import github.Commit
 import github.File
@@ -389,10 +385,10 @@ class PullRequest(github.GithubObject.CompletableGithubObject):
         :param position: integer
         :rtype: :class:`github.PullRequestComment.PullRequestComment`
         """
-        assert isinstance(body, (str, six.text_type)), body
+        assert isinstance(body, str), body
         assert isinstance(commit_id, github.Commit.Commit), commit_id
-        assert isinstance(path, (str, six.text_type)), path
-        assert isinstance(position, six.integer_types), position
+        assert isinstance(path, str), path
+        assert isinstance(position, int), position
         post_parameters = {
             "body": body,
             "commit_id": commit_id._identity,
@@ -412,7 +408,7 @@ class PullRequest(github.GithubObject.CompletableGithubObject):
         :param body: string
         :rtype: :class:`github.IssueComment.IssueComment`
         """
-        assert isinstance(body, (str, six.text_type)), body
+        assert isinstance(body, str), body
         post_parameters = {
             "body": body,
         }
@@ -478,13 +474,11 @@ class PullRequest(github.GithubObject.CompletableGithubObject):
         """
         post_parameters = dict()
         if reviewers is not github.GithubObject.NotSet:
-            assert all(
-                isinstance(element, (str, six.text_type)) for element in reviewers
-            ), reviewers
+            assert all(isinstance(element, str) for element in reviewers), reviewers
             post_parameters["reviewers"] = reviewers
         if team_reviewers is not github.GithubObject.NotSet:
             assert all(
-                isinstance(element, (str, six.text_type)) for element in team_reviewers
+                isinstance(element, str) for element in team_reviewers
             ), team_reviewers
             post_parameters["team_reviewers"] = team_reviewers
         headers, data = self._requester.requestJsonAndCheck(
@@ -504,13 +498,11 @@ class PullRequest(github.GithubObject.CompletableGithubObject):
         """
         post_parameters = dict()
         if reviewers is not github.GithubObject.NotSet:
-            assert all(
-                isinstance(element, (str, six.text_type)) for element in reviewers
-            ), reviewers
+            assert all(isinstance(element, str) for element in reviewers), reviewers
             post_parameters["reviewers"] = reviewers
         if team_reviewers is not github.GithubObject.NotSet:
             assert all(
-                isinstance(element, (str, six.text_type)) for element in team_reviewers
+                isinstance(element, str) for element in team_reviewers
             ), team_reviewers
             post_parameters["team_reviewers"] = team_reviewers
         headers, data = self._requester.requestJsonAndCheck(
@@ -532,18 +524,10 @@ class PullRequest(github.GithubObject.CompletableGithubObject):
         :param base: string
         :rtype: None
         """
-        assert title is github.GithubObject.NotSet or isinstance(
-            title, (str, six.text_type)
-        ), title
-        assert body is github.GithubObject.NotSet or isinstance(
-            body, (str, six.text_type)
-        ), body
-        assert state is github.GithubObject.NotSet or isinstance(
-            state, (str, six.text_type)
-        ), state
-        assert base is github.GithubObject.NotSet or isinstance(
-            base, (str, six.text_type)
-        ), base
+        assert title is github.GithubObject.NotSet or isinstance(title, str), title
+        assert body is github.GithubObject.NotSet or isinstance(body, str), body
+        assert state is github.GithubObject.NotSet or isinstance(state, str), state
+        assert base is github.GithubObject.NotSet or isinstance(base, str), base
         post_parameters = dict()
         if title is not github.GithubObject.NotSet:
             post_parameters["title"] = title
@@ -572,7 +556,7 @@ class PullRequest(github.GithubObject.CompletableGithubObject):
         :param id: integer
         :rtype: :class:`github.PullRequestComment.PullRequestComment`
         """
-        assert isinstance(id, six.integer_types), id
+        assert isinstance(id, int), id
         headers, data = self._requester.requestJsonAndCheck(
             "GET", self._parentUrl(self.url) + "/comments/" + str(id)
         )
@@ -614,7 +598,7 @@ class PullRequest(github.GithubObject.CompletableGithubObject):
         :param id: integer
         :rtype: :class:`github.PaginatedList.PaginatedList` of :class:`github.PullRequestComment.PullRequestComment`
         """
-        assert isinstance(id, six.integer_types), id
+        assert isinstance(id, int), id
         return github.PaginatedList.PaginatedList(
             github.PullRequestComment.PullRequestComment,
             self._requester,
@@ -646,7 +630,7 @@ class PullRequest(github.GithubObject.CompletableGithubObject):
         :param id: integer
         :rtype: :class:`github.IssueComment.IssueComment`
         """
-        assert isinstance(id, six.integer_types), id
+        assert isinstance(id, int), id
         headers, data = self._requester.requestJsonAndCheck(
             "GET", self._parentUrl(self.issue_url) + "/comments/" + str(id)
         )
@@ -685,7 +669,7 @@ class PullRequest(github.GithubObject.CompletableGithubObject):
         :param id: integer
         :rtype: :class:`github.PullRequestReview.PullRequestReview`
         """
-        assert isinstance(id, six.integer_types), id
+        assert isinstance(id, int), id
         headers, data = self._requester.requestJsonAndCheck(
             "GET", self.url + "/reviews/" + str(id),
         )
@@ -743,8 +727,7 @@ class PullRequest(github.GithubObject.CompletableGithubObject):
         :rtype: None
         """
         assert all(
-            isinstance(element, (github.Label.Label, str, six.text_type))
-            for element in labels
+            isinstance(element, (github.Label.Label, str)) for element in labels
         ), labels
         post_parameters = [
             label.name if isinstance(label, github.Label.Label) else label
@@ -769,11 +752,11 @@ class PullRequest(github.GithubObject.CompletableGithubObject):
         :param label: :class:`github.Label.Label` or string
         :rtype: None
         """
-        assert isinstance(label, (github.Label.Label, str, six.text_type)), label
+        assert isinstance(label, (github.Label.Label, str)), label
         if isinstance(label, github.Label.Label):
             label = label._identity
         else:
-            label = six.moves.urllib.parse.quote(label)
+            label = urllib.parse.quote(label)
         headers, data = self._requester.requestJsonAndCheck(
             "DELETE", self.issue_url + "/labels/" + label
         )
@@ -785,8 +768,7 @@ class PullRequest(github.GithubObject.CompletableGithubObject):
         :rtype: None
         """
         assert all(
-            isinstance(element, (github.Label.Label, str, six.text_type))
-            for element in labels
+            isinstance(element, (github.Label.Label, str)) for element in labels
         ), labels
         post_parameters = [
             label.name if isinstance(label, github.Label.Label) else label
@@ -817,17 +799,15 @@ class PullRequest(github.GithubObject.CompletableGithubObject):
         :rtype: :class:`github.PullRequestMergeStatus.PullRequestMergeStatus`
         """
         assert commit_message is github.GithubObject.NotSet or isinstance(
-            commit_message, (str, six.text_type)
+            commit_message, str
         ), commit_message
         assert commit_title is github.GithubObject.NotSet or isinstance(
-            commit_title, (str, six.text_type)
+            commit_title, str
         ), commit_title
         assert merge_method is github.GithubObject.NotSet or isinstance(
-            merge_method, (str, six.text_type)
+            merge_method, str
         ), merge_method
-        assert sha is github.GithubObject.NotSet or isinstance(
-            sha, (str, six.text_type)
-        ), sha
+        assert sha is github.GithubObject.NotSet or isinstance(sha, str), sha
         post_parameters = dict()
         if commit_message is not github.GithubObject.NotSet:
             post_parameters["commit_message"] = commit_message
@@ -896,7 +876,7 @@ class PullRequest(github.GithubObject.CompletableGithubObject):
         :param expected_head_sha: string
         :rtype: bool
         """
-        assert isinstance(expected_head_sha, (str, six.text_type)), expected_head_sha
+        assert isinstance(expected_head_sha, str), expected_head_sha
         post_parameters = {"expected_head_sha": expected_head_sha}
         status, headers, data = self._requester.requestJson(
             "PUT",
diff --git a/github/PullRequestComment.py b/github/PullRequestComment.py
index 4b5dcaa8..e6e0e82e 100644
--- a/github/PullRequestComment.py
+++ b/github/PullRequestComment.py
@@ -34,10 +34,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
-import six
-
 import github.GithubObject
 import github.NamedUser
 
@@ -185,7 +181,7 @@ class PullRequestComment(github.GithubObject.CompletableGithubObject):
         :param body: string
         :rtype: None
         """
-        assert isinstance(body, (str, six.text_type)), body
+        assert isinstance(body, str), body
         post_parameters = {
             "body": body,
         }
@@ -215,9 +211,7 @@ class PullRequestComment(github.GithubObject.CompletableGithubObject):
         :param reaction_type: string
         :rtype: :class:`github.Reaction.Reaction`
         """
-        assert isinstance(
-            reaction_type, (str, six.text_type)
-        ), "reaction type should be a string"
+        assert isinstance(reaction_type, str), "reaction type should be a string"
         assert reaction_type in [
             "+1",
             "-1",
diff --git a/github/PullRequestMergeStatus.py b/github/PullRequestMergeStatus.py
index 00018111..add34390 100644
--- a/github/PullRequestMergeStatus.py
+++ b/github/PullRequestMergeStatus.py
@@ -31,8 +31,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.GithubObject
 
 
diff --git a/github/PullRequestPart.py b/github/PullRequestPart.py
index 5bd6a33a..a069b2f1 100644
--- a/github/PullRequestPart.py
+++ b/github/PullRequestPart.py
@@ -30,8 +30,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.GithubObject
 import github.NamedUser
 import github.Repository
diff --git a/github/PullRequestReview.py b/github/PullRequestReview.py
index edd53de4..59f603b1 100644
--- a/github/PullRequestReview.py
+++ b/github/PullRequestReview.py
@@ -26,10 +26,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
-import six
-
 import github.GithubObject
 import github.NamedUser
 
@@ -119,7 +115,7 @@ class PullRequestReview(github.GithubObject.CompletableGithubObject):
         :calls: `PUT /repos/:owner/:repo/pulls/:number/reviews/:review_id/dismissals <https://developer.github.com/v3/pulls/reviews/>`_
         :rtype: None
         """
-        assert isinstance(message, (str, six.text_type)), message
+        assert isinstance(message, str), message
         post_parameters = {"message": message}
         headers, data = self._requester.requestJsonAndCheck(
             "PUT",
diff --git a/github/Rate.py b/github/Rate.py
index 9646290b..2b78af73 100644
--- a/github/Rate.py
+++ b/github/Rate.py
@@ -27,8 +27,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.GithubObject
 
 
diff --git a/github/RateLimit.py b/github/RateLimit.py
index eba10a7b..b1a173fe 100644
--- a/github/RateLimit.py
+++ b/github/RateLimit.py
@@ -27,8 +27,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 from deprecated import deprecated
 
 import github.GithubObject
diff --git a/github/Reaction.py b/github/Reaction.py
index 10f8d048..624ac8b7 100644
--- a/github/Reaction.py
+++ b/github/Reaction.py
@@ -24,8 +24,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.GithubObject
 import github.NamedUser
 
diff --git a/github/Referrer.py b/github/Referrer.py
index 1c10a495..e2140764 100644
--- a/github/Referrer.py
+++ b/github/Referrer.py
@@ -26,8 +26,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.GithubObject
 
 
diff --git a/github/Repository.py b/github/Repository.py
index 0faea720..c1d1e466 100644
--- a/github/Repository.py
+++ b/github/Repository.py
@@ -85,14 +85,11 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import collections
 import datetime
+import urllib.parse
 from base64 import b64encode
 
-import six
-import six.moves.urllib.parse
 from deprecated import deprecated
 
 import github.Branch
@@ -783,10 +780,10 @@ class Repository(github.GithubObject.CompletableGithubObject):
         :rtype: None
         """
         assert isinstance(collaborator, github.NamedUser.NamedUser) or isinstance(
-            collaborator, (str, six.text_type)
+            collaborator, str
         ), collaborator
         assert permission is github.GithubObject.NotSet or isinstance(
-            permission, (str, six.text_type)
+            permission, str
         ), permission
 
         if isinstance(collaborator, github.NamedUser.NamedUser):
@@ -815,7 +812,7 @@ class Repository(github.GithubObject.CompletableGithubObject):
         :rtype: string
         """
         assert isinstance(collaborator, github.NamedUser.NamedUser) or isinstance(
-            collaborator, (str, six.text_type)
+            collaborator, str
         ), collaborator
         if isinstance(collaborator, github.NamedUser.NamedUser):
             collaborator = collaborator._identity
@@ -854,8 +851,8 @@ class Repository(github.GithubObject.CompletableGithubObject):
         :param head: string
         :rtype: :class:`github.Comparison.Comparison`
         """
-        assert isinstance(base, (str, six.text_type)), base
-        assert isinstance(head, (str, six.text_type)), head
+        assert isinstance(base, str), base
+        assert isinstance(head, str), head
         headers, data = self._requester.requestJsonAndCheck(
             "GET", self.url + "/compare/" + base + "..." + head
         )
@@ -870,8 +867,8 @@ class Repository(github.GithubObject.CompletableGithubObject):
         :param encoding: string
         :rtype: :class:`github.GitBlob.GitBlob`
         """
-        assert isinstance(content, (str, six.text_type)), content
-        assert isinstance(encoding, (str, six.text_type)), encoding
+        assert isinstance(content, str), content
+        assert isinstance(encoding, str), encoding
         post_parameters = {
             "content": content,
             "encoding": encoding,
@@ -898,7 +895,7 @@ class Repository(github.GithubObject.CompletableGithubObject):
         :param committer: :class:`github.InputGitAuthor.InputGitAuthor`
         :rtype: :class:`github.GitCommit.GitCommit`
         """
-        assert isinstance(message, (str, six.text_type)), message
+        assert isinstance(message, str), message
         assert isinstance(tree, github.GitTree.GitTree), tree
         assert all(
             isinstance(element, github.GitCommit.GitCommit) for element in parents
@@ -932,8 +929,8 @@ class Repository(github.GithubObject.CompletableGithubObject):
         :param sha: string
         :rtype: :class:`github.GitRef.GitRef`
         """
-        assert isinstance(ref, (str, six.text_type)), ref
-        assert isinstance(sha, (str, six.text_type)), sha
+        assert isinstance(ref, str), ref
+        assert isinstance(sha, str), sha
         post_parameters = {
             "ref": ref,
             "sha": sha,
@@ -979,16 +976,15 @@ class Repository(github.GithubObject.CompletableGithubObject):
         :param target_commitish: string or :class:`github.Branch.Branch` or :class:`github.Commit.Commit` or :class:`github.GitCommit.GitCommit`
         :rtype: :class:`github.GitRelease.GitRelease`
         """
-        assert isinstance(tag, (str, six.text_type)), tag
-        assert isinstance(name, (str, six.text_type)), name
-        assert isinstance(message, (str, six.text_type)), message
+        assert isinstance(tag, str), tag
+        assert isinstance(name, str), name
+        assert isinstance(message, str), message
         assert isinstance(draft, bool), draft
         assert isinstance(prerelease, bool), prerelease
         assert target_commitish is github.GithubObject.NotSet or isinstance(
             target_commitish,
             (
                 str,
-                six.text_type,
                 github.Branch.Branch,
                 github.Commit.Commit,
                 github.GitCommit.GitCommit,
@@ -1001,7 +997,7 @@ class Repository(github.GithubObject.CompletableGithubObject):
             "draft": draft,
             "prerelease": prerelease,
         }
-        if isinstance(target_commitish, (str, six.text_type)):
+        if isinstance(target_commitish, str):
             post_parameters["target_commitish"] = target_commitish
         elif isinstance(target_commitish, github.Branch.Branch):
             post_parameters["target_commitish"] = target_commitish.name
@@ -1028,10 +1024,10 @@ class Repository(github.GithubObject.CompletableGithubObject):
         :param tagger: :class:`github.InputGitAuthor.InputGitAuthor`
         :rtype: :class:`github.GitTag.GitTag`
         """
-        assert isinstance(tag, (str, six.text_type)), tag
-        assert isinstance(message, (str, six.text_type)), message
-        assert isinstance(object, (str, six.text_type)), object
-        assert isinstance(type, (str, six.text_type)), type
+        assert isinstance(tag, str), tag
+        assert isinstance(message, str), message
+        assert isinstance(object, str), object
+        assert isinstance(type, str), type
         assert tagger is github.GithubObject.NotSet or isinstance(
             tagger, github.InputGitAuthor
         ), tagger
@@ -1086,10 +1082,10 @@ class Repository(github.GithubObject.CompletableGithubObject):
         :param active: bool
         :rtype: :class:`github.Hook.Hook`
         """
-        assert isinstance(name, (str, six.text_type)), name
+        assert isinstance(name, str), name
         assert isinstance(config, dict), config
         assert events is github.GithubObject.NotSet or all(
-            isinstance(element, (str, six.text_type)) for element in events
+            isinstance(element, str) for element in events
         ), events
         assert active is github.GithubObject.NotSet or isinstance(active, bool), active
         post_parameters = {
@@ -1124,26 +1120,22 @@ class Repository(github.GithubObject.CompletableGithubObject):
         :param labels: list of :class:`github.Label.Label`
         :rtype: :class:`github.Issue.Issue`
         """
-        assert isinstance(title, (str, six.text_type)), title
-        assert body is github.GithubObject.NotSet or isinstance(
-            body, (str, six.text_type)
-        ), body
+        assert isinstance(title, str), title
+        assert body is github.GithubObject.NotSet or isinstance(body, str), body
         assert (
             assignee is github.GithubObject.NotSet
             or isinstance(assignee, github.NamedUser.NamedUser)
-            or isinstance(assignee, (str, six.text_type))
+            or isinstance(assignee, str)
         ), assignee
         assert assignees is github.GithubObject.NotSet or all(
-            isinstance(element, github.NamedUser.NamedUser)
-            or isinstance(element, (str, six.text_type))
+            isinstance(element, github.NamedUser.NamedUser) or isinstance(element, str)
             for element in assignees
         ), assignees
         assert milestone is github.GithubObject.NotSet or isinstance(
             milestone, github.Milestone.Milestone
         ), milestone
         assert labels is github.GithubObject.NotSet or all(
-            isinstance(element, github.Label.Label)
-            or isinstance(element, (str, six.text_type))
+            isinstance(element, github.Label.Label) or isinstance(element, str)
             for element in labels
         ), labels
 
@@ -1153,7 +1145,7 @@ class Repository(github.GithubObject.CompletableGithubObject):
         if body is not github.GithubObject.NotSet:
             post_parameters["body"] = body
         if assignee is not github.GithubObject.NotSet:
-            if isinstance(assignee, (str, six.text_type)):
+            if isinstance(assignee, str):
                 post_parameters["assignee"] = assignee
             else:
                 post_parameters["assignee"] = assignee._identity
@@ -1184,8 +1176,8 @@ class Repository(github.GithubObject.CompletableGithubObject):
         :param read_only: bool
         :rtype: :class:`github.RepositoryKey.RepositoryKey`
         """
-        assert isinstance(title, (str, six.text_type)), title
-        assert isinstance(key, (str, six.text_type)), key
+        assert isinstance(title, str), title
+        assert isinstance(key, str), key
         assert isinstance(read_only, bool), read_only
         post_parameters = {
             "title": title,
@@ -1207,10 +1199,10 @@ class Repository(github.GithubObject.CompletableGithubObject):
         :param description: string
         :rtype: :class:`github.Label.Label`
         """
-        assert isinstance(name, (str, six.text_type)), name
-        assert isinstance(color, (str, six.text_type)), color
+        assert isinstance(name, str), name
+        assert isinstance(color, str), color
         assert description is github.GithubObject.NotSet or isinstance(
-            description, (str, six.text_type)
+            description, str
         ), description
         post_parameters = {
             "name": name,
@@ -1241,12 +1233,10 @@ class Repository(github.GithubObject.CompletableGithubObject):
         :param due_on: datetime
         :rtype: :class:`github.Milestone.Milestone`
         """
-        assert isinstance(title, (str, six.text_type)), title
-        assert state is github.GithubObject.NotSet or isinstance(
-            state, (str, six.text_type)
-        ), state
+        assert isinstance(title, str), title
+        assert state is github.GithubObject.NotSet or isinstance(state, str), state
         assert description is github.GithubObject.NotSet or isinstance(
-            description, (str, six.text_type)
+            description, str
         ), description
         assert due_on is github.GithubObject.NotSet or isinstance(
             due_on, (datetime.datetime, datetime.date)
@@ -1276,10 +1266,8 @@ class Repository(github.GithubObject.CompletableGithubObject):
         :param name: string
         :param body: string
         """
-        assert isinstance(name, (str, six.text_type)), name
-        assert body is github.GithubObject.NotSet or isinstance(
-            body, (str, six.text_type)
-        ), body
+        assert isinstance(name, str), name
+        assert body is github.GithubObject.NotSet or isinstance(body, str), body
         post_parameters = {
             "name": name,
             "body": body,
@@ -1311,10 +1299,10 @@ class Repository(github.GithubObject.CompletableGithubObject):
     def __create_pull_1(
         self, title, body, base, head, maintainer_can_modify=github.GithubObject.NotSet
     ):
-        assert isinstance(title, (str, six.text_type)), title
-        assert isinstance(body, (str, six.text_type)), body
-        assert isinstance(base, (str, six.text_type)), base
-        assert isinstance(head, (str, six.text_type)), head
+        assert isinstance(title, str), title
+        assert isinstance(body, str), body
+        assert isinstance(base, str), base
+        assert isinstance(head, str), head
         assert maintainer_can_modify is github.GithubObject.NotSet or isinstance(
             maintainer_can_modify, bool
         ), maintainer_can_modify
@@ -1331,8 +1319,8 @@ class Repository(github.GithubObject.CompletableGithubObject):
 
     def __create_pull_2(self, issue, base, head):
         assert isinstance(issue, github.Issue.Issue), issue
-        assert isinstance(base, (str, six.text_type)), base
-        assert isinstance(head, (str, six.text_type)), head
+        assert isinstance(base, str), base
+        assert isinstance(head, str), head
         return self.__create_pull(issue=issue._identity, base=base, head=head)
 
     def __create_pull(self, **kwds):
@@ -1359,13 +1347,13 @@ class Repository(github.GithubObject.CompletableGithubObject):
         :param vcs_password: string
         :rtype: :class:`github.SourceImport.SourceImport`
         """
-        assert isinstance(vcs, (str, six.text_type)), vcs
-        assert isinstance(vcs_url, (str, six.text_type)), vcs_url
+        assert isinstance(vcs, str), vcs
+        assert isinstance(vcs_url, str), vcs_url
         assert vcs_username is github.GithubObject.NotSet or isinstance(
-            vcs_username, (str, six.text_type)
+            vcs_username, str
         ), vcs_username
         assert vcs_password is github.GithubObject.NotSet or isinstance(
-            vcs_password, (str, six.text_type)
+            vcs_password, str
         ), vcs_password
         put_parameters = {"vcs": vcs, "vcs_url": vcs_url}
 
@@ -1427,12 +1415,12 @@ class Repository(github.GithubObject.CompletableGithubObject):
         """
         if name is None:
             name = self.name
-        assert isinstance(name, (str, six.text_type)), name
+        assert isinstance(name, str), name
         assert description is github.GithubObject.NotSet or isinstance(
-            description, (str, six.text_type)
+            description, str
         ), description
         assert homepage is github.GithubObject.NotSet or isinstance(
-            homepage, (str, six.text_type)
+            homepage, str
         ), homepage
         assert private is github.GithubObject.NotSet or isinstance(
             private, bool
@@ -1450,7 +1438,7 @@ class Repository(github.GithubObject.CompletableGithubObject):
             has_downloads, bool
         ), has_downloads
         assert default_branch is github.GithubObject.NotSet or isinstance(
-            default_branch, (str, six.text_type)
+            default_branch, str
         ), default_branch
         assert allow_squash_merge is github.GithubObject.NotSet or isinstance(
             allow_squash_merge, bool
@@ -1503,10 +1491,8 @@ class Repository(github.GithubObject.CompletableGithubObject):
         :param ref: string
         :rtype: string
         """
-        assert isinstance(archive_format, (str, six.text_type)), archive_format
-        assert ref is github.GithubObject.NotSet or isinstance(
-            ref, (str, six.text_type)
-        ), ref
+        assert isinstance(archive_format, str), archive_format
+        assert ref is github.GithubObject.NotSet or isinstance(ref, str), ref
         url = self.url + "/" + archive_format
         if ref is not github.GithubObject.NotSet:
             url += "/" + ref
@@ -1528,7 +1514,7 @@ class Repository(github.GithubObject.CompletableGithubObject):
         :param branch: string
         :rtype: :class:`github.Branch.Branch`
         """
-        assert isinstance(branch, (str, six.text_type)), branch
+        assert isinstance(branch, str), branch
         headers, data = self._requester.requestJsonAndCheck(
             "GET", self.url + "/branches/" + branch
         )
@@ -1572,7 +1558,7 @@ class Repository(github.GithubObject.CompletableGithubObject):
         :param id: integer
         :rtype: :class:`github.CommitComment.CommitComment`
         """
-        assert isinstance(id, six.integer_types), id
+        assert isinstance(id, int), id
         headers, data = self._requester.requestJsonAndCheck(
             "GET", self.url + "/comments/" + str(id)
         )
@@ -1598,7 +1584,7 @@ class Repository(github.GithubObject.CompletableGithubObject):
         :param sha: string
         :rtype: :class:`github.Commit.Commit`
         """
-        assert isinstance(sha, (str, six.text_type)), sha
+        assert isinstance(sha, str), sha
         headers, data = self._requester.requestJsonAndCheck(
             "GET", self.url + "/commits/" + sha
         )
@@ -1621,12 +1607,8 @@ class Repository(github.GithubObject.CompletableGithubObject):
         :param author: string or :class:`github.NamedUser.NamedUser` or :class:`github.AuthenticatedUser.AuthenticatedUser`
         :rtype: :class:`github.PaginatedList.PaginatedList` of :class:`github.Commit.Commit`
         """
-        assert sha is github.GithubObject.NotSet or isinstance(
-            sha, (str, six.text_type)
-        ), sha
-        assert path is github.GithubObject.NotSet or isinstance(
-            path, (str, six.text_type)
-        ), path
+        assert sha is github.GithubObject.NotSet or isinstance(sha, str), sha
+        assert path is github.GithubObject.NotSet or isinstance(path, str), path
         assert since is github.GithubObject.NotSet or isinstance(
             since, datetime.datetime
         ), since
@@ -1637,7 +1619,6 @@ class Repository(github.GithubObject.CompletableGithubObject):
             author,
             (
                 str,
-                six.text_type,
                 github.NamedUser.NamedUser,
                 github.AuthenticatedUser.AuthenticatedUser,
             ),
@@ -1673,10 +1654,8 @@ class Repository(github.GithubObject.CompletableGithubObject):
         :param ref: string
         :rtype: :class:`github.ContentFile.ContentFile` or a list of them
         """
-        assert isinstance(path, (str, six.text_type)), path
-        assert ref is github.GithubObject.NotSet or isinstance(
-            ref, (str, six.text_type)
-        ), ref
+        assert isinstance(path, str), path
+        assert ref is github.GithubObject.NotSet or isinstance(ref, str), ref
         # Path of '/' should be the empty string.
         if path == "/":
             path = ""
@@ -1685,7 +1664,7 @@ class Repository(github.GithubObject.CompletableGithubObject):
             url_parameters["ref"] = ref
         headers, data = self._requester.requestJsonAndCheck(
             "GET",
-            self.url + "/contents/" + six.moves.urllib.parse.quote(path),
+            self.url + "/contents/" + urllib.parse.quote(path),
             parameters=url_parameters,
         )
 
@@ -1743,7 +1722,7 @@ class Repository(github.GithubObject.CompletableGithubObject):
         :rtype: None or list of :class:`github.View.View`
         """
         assert per is github.GithubObject.NotSet or (
-            isinstance(per, (str, six.text_type)) and (per == "day" or per == "week")
+            isinstance(per, str) and (per == "day" or per == "week")
         ), "per must be day or week, day by default"
         url_parameters = dict()
         if per is not github.GithubObject.NotSet:
@@ -1769,7 +1748,7 @@ class Repository(github.GithubObject.CompletableGithubObject):
         :rtype: None or list of :class:`github.Clone.Clone`
         """
         assert per is github.GithubObject.NotSet or (
-            isinstance(per, (str, six.text_type)) and (per == "day" or per == "week")
+            isinstance(per, str) and (per == "day" or per == "week")
         ), "per must be day or week, day by default"
         url_parameters = dict()
         if per is not github.GithubObject.NotSet:
@@ -1829,22 +1808,16 @@ class Repository(github.GithubObject.CompletableGithubObject):
             'content': :class:`ContentFile <github.ContentFile.ContentFile>`:,
             'commit': :class:`Commit <github.Commit.Commit>`}
         """
-        assert isinstance(path, (str, six.text_type)), "path must be str/unicode object"
-        assert isinstance(
-            message, (str, six.text_type)
-        ), "message must be str/unicode object"
-        assert isinstance(
-            content, (str, six.text_type, bytes)
-        ), "content must be a str/unicode object"
-        assert branch is github.GithubObject.NotSet or isinstance(
-            branch, (str, six.text_type)
-        ), "branch must be a str/unicode object"
+        assert isinstance(path, str)
+        assert isinstance(message, str)
+        assert isinstance(content, (str, bytes))
+        assert branch is github.GithubObject.NotSet or isinstance(branch, str)
         assert author is github.GithubObject.NotSet or isinstance(
             author, github.InputGitAuthor
-        ), "author must be a github.InputGitAuthor object"
+        )
         assert committer is github.GithubObject.NotSet or isinstance(
             committer, github.InputGitAuthor
-        ), "committer must be a github.InputGitAuthor object"
+        )
 
         if not isinstance(content, bytes):
             content = content.encode("utf-8")
@@ -1860,7 +1833,7 @@ class Repository(github.GithubObject.CompletableGithubObject):
 
         headers, data = self._requester.requestJsonAndCheck(
             "PUT",
-            self.url + "/contents/" + six.moves.urllib.parse.quote(path),
+            self.url + "/contents/" + urllib.parse.quote(path),
             input=put_parameters,
         )
 
@@ -1897,23 +1870,17 @@ class Repository(github.GithubObject.CompletableGithubObject):
             'content': :class:`ContentFile <github.ContentFile.ContentFile>`:,
             'commit': :class:`Commit <github.Commit.Commit>`}
         """
-        assert isinstance(path, (str, six.text_type)), "path must be str/unicode object"
-        assert isinstance(
-            message, (str, six.text_type)
-        ), "message must be str/unicode object"
-        assert isinstance(
-            content, (str, six.text_type, bytes)
-        ), "content must be a str/unicode object"
-        assert isinstance(sha, (str, six.text_type)), "sha must be a str/unicode object"
-        assert branch is github.GithubObject.NotSet or isinstance(
-            branch, (str, six.text_type)
-        ), "branch must be a str/unicode object"
+        assert isinstance(path, str)
+        assert isinstance(message, str)
+        assert isinstance(content, (str, bytes))
+        assert isinstance(sha, str)
+        assert branch is github.GithubObject.NotSet or isinstance(branch, str)
         assert author is github.GithubObject.NotSet or isinstance(
             author, github.InputGitAuthor
-        ), "author must be a github.InputGitAuthor object"
+        )
         assert committer is github.GithubObject.NotSet or isinstance(
             committer, github.InputGitAuthor
-        ), "committer must be a github.InputGitAuthor object"
+        )
 
         if not isinstance(content, bytes):
             content = content.encode("utf-8")
@@ -1930,7 +1897,7 @@ class Repository(github.GithubObject.CompletableGithubObject):
 
         headers, data = self._requester.requestJsonAndCheck(
             "PUT",
-            self.url + "/contents/" + six.moves.urllib.parse.quote(path),
+            self.url + "/contents/" + urllib.parse.quote(path),
             input=put_parameters,
         )
 
@@ -1965,13 +1932,11 @@ class Repository(github.GithubObject.CompletableGithubObject):
             'content': :class:`null <github.GithubObject.NotSet>`:,
             'commit': :class:`Commit <github.Commit.Commit>`}
         """
-        assert isinstance(path, (str, six.text_type)), "path must be str/unicode object"
-        assert isinstance(
-            message, (str, six.text_type)
-        ), "message must be str/unicode object"
-        assert isinstance(sha, (str, six.text_type)), "sha must be a str/unicode object"
+        assert isinstance(path, str), "path must be str/unicode object"
+        assert isinstance(message, str), "message must be str/unicode object"
+        assert isinstance(sha, str), "sha must be a str/unicode object"
         assert branch is github.GithubObject.NotSet or isinstance(
-            branch, (str, six.text_type)
+            branch, str
         ), "branch must be a str/unicode object"
         assert author is github.GithubObject.NotSet or isinstance(
             author, github.InputGitAuthor
@@ -1990,7 +1955,7 @@ class Repository(github.GithubObject.CompletableGithubObject):
 
         headers, data = self._requester.requestJsonAndCheck(
             "DELETE",
-            self.url + "/contents/" + six.moves.urllib.parse.quote(path),
+            self.url + "/contents/" + urllib.parse.quote(path),
             input=url_parameters,
         )
 
@@ -2039,7 +2004,7 @@ class Repository(github.GithubObject.CompletableGithubObject):
         :param id: integer
         :rtype: :class:`github.Download.Download`
         """
-        assert isinstance(id, six.integer_types), id
+        assert isinstance(id, int), id
         headers, data = self._requester.requestJsonAndCheck(
             "GET", self.url + "/downloads/" + str(id)
         )
@@ -2079,7 +2044,7 @@ class Repository(github.GithubObject.CompletableGithubObject):
         :rtype: :class:`github.Repository.Repository`
         """
         assert organization is github.GithubObject.NotSet or isinstance(
-            organization, (str, six.text_type)
+            organization, str
         ), organization
         post_parameters = {}
         if organization is not None:
@@ -2095,7 +2060,7 @@ class Repository(github.GithubObject.CompletableGithubObject):
         :param sha: string
         :rtype: :class:`github.GitBlob.GitBlob`
         """
-        assert isinstance(sha, (str, six.text_type)), sha
+        assert isinstance(sha, str), sha
         headers, data = self._requester.requestJsonAndCheck(
             "GET", self.url + "/git/blobs/" + sha
         )
@@ -2107,7 +2072,7 @@ class Repository(github.GithubObject.CompletableGithubObject):
         :param sha: string
         :rtype: :class:`github.GitCommit.GitCommit`
         """
-        assert isinstance(sha, (str, six.text_type)), sha
+        assert isinstance(sha, str), sha
         headers, data = self._requester.requestJsonAndCheck(
             "GET", self.url + "/git/commits/" + sha
         )
@@ -2124,7 +2089,7 @@ class Repository(github.GithubObject.CompletableGithubObject):
         prefix = "/git/refs/"
         if not self._requester.FIX_REPO_GET_GIT_REF:
             prefix = "/git/"
-        assert isinstance(ref, (str, six.text_type)), ref
+        assert isinstance(ref, str), ref
         headers, data = self._requester.requestJsonAndCheck(
             "GET", self.url + prefix + ref
         )
@@ -2145,7 +2110,7 @@ class Repository(github.GithubObject.CompletableGithubObject):
         :param sha: string
         :rtype: :class:`github.GitTag.GitTag`
         """
-        assert isinstance(sha, (str, six.text_type)), sha
+        assert isinstance(sha, str), sha
         headers, data = self._requester.requestJsonAndCheck(
             "GET", self.url + "/git/tags/" + sha
         )
@@ -2158,7 +2123,7 @@ class Repository(github.GithubObject.CompletableGithubObject):
         :param recursive: bool
         :rtype: :class:`github.GitTree.GitTree`
         """
-        assert isinstance(sha, (str, six.text_type)), sha
+        assert isinstance(sha, str), sha
         assert recursive is github.GithubObject.NotSet or isinstance(
             recursive, bool
         ), recursive
@@ -2177,7 +2142,7 @@ class Repository(github.GithubObject.CompletableGithubObject):
         :param id: integer
         :rtype: :class:`github.Hook.Hook`
         """
-        assert isinstance(id, six.integer_types), id
+        assert isinstance(id, int), id
         headers, data = self._requester.requestJsonAndCheck(
             "GET", self.url + "/hooks/" + str(id)
         )
@@ -2198,7 +2163,7 @@ class Repository(github.GithubObject.CompletableGithubObject):
         :param number: integer
         :rtype: :class:`github.Issue.Issue`
         """
-        assert isinstance(number, six.integer_types), number
+        assert isinstance(number, int), number
         headers, data = self._requester.requestJsonAndCheck(
             "GET", self.url + "/issues/" + str(number)
         )
@@ -2235,13 +2200,11 @@ class Repository(github.GithubObject.CompletableGithubObject):
             or milestone == "none"
             or isinstance(milestone, github.Milestone.Milestone)
         ), milestone
-        assert state is github.GithubObject.NotSet or isinstance(
-            state, (str, six.text_type)
-        ), state
+        assert state is github.GithubObject.NotSet or isinstance(state, str), state
         assert (
             assignee is github.GithubObject.NotSet
             or isinstance(assignee, github.NamedUser.NamedUser)
-            or isinstance(assignee, (str, six.text_type))
+            or isinstance(assignee, str)
         ), assignee
         assert mentioned is github.GithubObject.NotSet or isinstance(
             mentioned, github.NamedUser.NamedUser
@@ -2249,11 +2212,9 @@ class Repository(github.GithubObject.CompletableGithubObject):
         assert labels is github.GithubObject.NotSet or all(
             isinstance(element, github.Label.Label) for element in labels
         ), labels
-        assert sort is github.GithubObject.NotSet or isinstance(
-            sort, (str, six.text_type)
-        ), sort
+        assert sort is github.GithubObject.NotSet or isinstance(sort, str), sort
         assert direction is github.GithubObject.NotSet or isinstance(
-            direction, (str, six.text_type)
+            direction, str
         ), direction
         assert since is github.GithubObject.NotSet or isinstance(
             since, datetime.datetime
@@ -2261,18 +2222,18 @@ class Repository(github.GithubObject.CompletableGithubObject):
         assert (
             creator is github.GithubObject.NotSet
             or isinstance(creator, github.NamedUser.NamedUser)
-            or isinstance(creator, (str, six.text_type))
+            or isinstance(creator, str)
         ), creator
         url_parameters = dict()
         if milestone is not github.GithubObject.NotSet:
-            if isinstance(milestone, (str, six.text_type)):
+            if isinstance(milestone, str):
                 url_parameters["milestone"] = milestone
             else:
                 url_parameters["milestone"] = milestone._identity
         if state is not github.GithubObject.NotSet:
             url_parameters["state"] = state
         if assignee is not github.GithubObject.NotSet:
-            if isinstance(assignee, (str, six.text_type)):
+            if isinstance(assignee, str):
                 url_parameters["assignee"] = assignee
             else:
                 url_parameters["assignee"] = assignee._identity
@@ -2287,7 +2248,7 @@ class Repository(github.GithubObject.CompletableGithubObject):
         if since is not github.GithubObject.NotSet:
             url_parameters["since"] = since.strftime("%Y-%m-%dT%H:%M:%SZ")
         if creator is not github.GithubObject.NotSet:
-            if isinstance(creator, (str, six.text_type)):
+            if isinstance(creator, str):
                 url_parameters["creator"] = creator
             else:
                 url_parameters["creator"] = creator._identity
@@ -2308,11 +2269,9 @@ class Repository(github.GithubObject.CompletableGithubObject):
         :param since: datetime.datetime
         :rtype: :class:`github.PaginatedList.PaginatedList` of :class:`github.IssueComment.IssueComment`
         """
-        assert sort is github.GithubObject.NotSet or isinstance(
-            sort, (str, six.text_type)
-        ), sort
+        assert sort is github.GithubObject.NotSet or isinstance(sort, str), sort
         assert direction is github.GithubObject.NotSet or isinstance(
-            direction, (str, six.text_type)
+            direction, str
         ), direction
         assert since is github.GithubObject.NotSet or isinstance(
             since, datetime.datetime
@@ -2337,7 +2296,7 @@ class Repository(github.GithubObject.CompletableGithubObject):
         :param id: integer
         :rtype: :class:`github.IssueEvent.IssueEvent`
         """
-        assert isinstance(id, six.integer_types), id
+        assert isinstance(id, int), id
         headers, data = self._requester.requestJsonAndCheck(
             "GET",
             self.url + "/issues/events/" + str(id),
@@ -2366,7 +2325,7 @@ class Repository(github.GithubObject.CompletableGithubObject):
         :param id: integer
         :rtype: :class:`github.RepositoryKey.RepositoryKey`
         """
-        assert isinstance(id, six.integer_types), id
+        assert isinstance(id, int), id
         headers, data = self._requester.requestJsonAndCheck(
             "GET", self.url + "/keys/" + str(id)
         )
@@ -2392,9 +2351,9 @@ class Repository(github.GithubObject.CompletableGithubObject):
         :param name: string
         :rtype: :class:`github.Label.Label`
         """
-        assert isinstance(name, (str, six.text_type)), name
+        assert isinstance(name, str), name
         headers, data = self._requester.requestJsonAndCheck(
-            "GET", self.url + "/labels/" + six.moves.urllib.parse.quote(name)
+            "GET", self.url + "/labels/" + urllib.parse.quote(name)
         )
         return github.Label.Label(self._requester, headers, data, completed=True)
 
@@ -2436,7 +2395,7 @@ class Repository(github.GithubObject.CompletableGithubObject):
         :param number: integer
         :rtype: :class:`github.Milestone.Milestone`
         """
-        assert isinstance(number, six.integer_types), number
+        assert isinstance(number, int), number
         headers, data = self._requester.requestJsonAndCheck(
             "GET", self.url + "/milestones/" + str(number)
         )
@@ -2457,14 +2416,10 @@ class Repository(github.GithubObject.CompletableGithubObject):
         :param direction: string
         :rtype: :class:`github.PaginatedList.PaginatedList` of :class:`github.Milestone.Milestone`
         """
-        assert state is github.GithubObject.NotSet or isinstance(
-            state, (str, six.text_type)
-        ), state
-        assert sort is github.GithubObject.NotSet or isinstance(
-            sort, (str, six.text_type)
-        ), sort
+        assert state is github.GithubObject.NotSet or isinstance(state, str), state
+        assert sort is github.GithubObject.NotSet or isinstance(sort, str), sort
         assert direction is github.GithubObject.NotSet or isinstance(
-            direction, (str, six.text_type)
+            direction, str
         ), direction
         url_parameters = dict()
         if state is not github.GithubObject.NotSet:
@@ -2498,7 +2453,7 @@ class Repository(github.GithubObject.CompletableGithubObject):
         :param number: integer
         :rtype: :class:`github.PullRequest.PullRequest`
         """
-        assert isinstance(number, six.integer_types), number
+        assert isinstance(number, int), number
         headers, data = self._requester.requestJsonAndCheck(
             "GET", self.url + "/pulls/" + str(number)
         )
@@ -2523,21 +2478,13 @@ class Repository(github.GithubObject.CompletableGithubObject):
         :param head: string
         :rtype: :class:`github.PaginatedList.PaginatedList` of :class:`github.PullRequest.PullRequest`
         """
-        assert state is github.GithubObject.NotSet or isinstance(
-            state, (str, six.text_type)
-        ), state
-        assert sort is github.GithubObject.NotSet or isinstance(
-            sort, (str, six.text_type)
-        ), sort
+        assert state is github.GithubObject.NotSet or isinstance(state, str), state
+        assert sort is github.GithubObject.NotSet or isinstance(sort, str), sort
         assert direction is github.GithubObject.NotSet or isinstance(
-            direction, (str, six.text_type)
+            direction, str
         ), direction
-        assert base is github.GithubObject.NotSet or isinstance(
-            base, (str, six.text_type)
-        ), base
-        assert head is github.GithubObject.NotSet or isinstance(
-            head, (str, six.text_type)
-        ), head
+        assert base is github.GithubObject.NotSet or isinstance(base, str), base
+        assert head is github.GithubObject.NotSet or isinstance(head, str), head
         url_parameters = dict()
         if state is not github.GithubObject.NotSet:
             url_parameters["state"] = state
@@ -2584,11 +2531,9 @@ class Repository(github.GithubObject.CompletableGithubObject):
         :param since: datetime.datetime
         :rtype: :class:`github.PaginatedList.PaginatedList` of :class:`github.PullRequestComment.PullRequestComment`
         """
-        assert sort is github.GithubObject.NotSet or isinstance(
-            sort, (str, six.text_type)
-        ), sort
+        assert sort is github.GithubObject.NotSet or isinstance(sort, str), sort
         assert direction is github.GithubObject.NotSet or isinstance(
-            direction, (str, six.text_type)
+            direction, str
         ), direction
         assert since is github.GithubObject.NotSet or isinstance(
             since, datetime.datetime
@@ -2613,9 +2558,7 @@ class Repository(github.GithubObject.CompletableGithubObject):
         :param ref: string
         :rtype: :class:`github.ContentFile.ContentFile`
         """
-        assert ref is github.GithubObject.NotSet or isinstance(
-            ref, (str, six.text_type)
-        ), ref
+        assert ref is github.GithubObject.NotSet or isinstance(ref, str), ref
         url_parameters = dict()
         if ref is not github.GithubObject.NotSet:
             url_parameters["ref"] = ref
@@ -2788,7 +2731,7 @@ class Repository(github.GithubObject.CompletableGithubObject):
             return github.GitRelease.GitRelease(
                 self._requester, headers, data, completed=True
             )
-        elif isinstance(id, (str, six.text_type)):
+        elif isinstance(id, str):
             headers, data = self._requester.requestJsonAndCheck(
                 "GET", self.url + "/releases/tags/" + id
             )
@@ -2845,7 +2788,7 @@ class Repository(github.GithubObject.CompletableGithubObject):
         :rtype: bool
         """
         assert isinstance(assignee, github.NamedUser.NamedUser) or isinstance(
-            assignee, (str, six.text_type)
+            assignee, str
         ), assignee
 
         if isinstance(assignee, github.NamedUser.NamedUser):
@@ -2863,7 +2806,7 @@ class Repository(github.GithubObject.CompletableGithubObject):
         :rtype: bool
         """
         assert isinstance(collaborator, github.NamedUser.NamedUser) or isinstance(
-            collaborator, (str, six.text_type)
+            collaborator, str
         ), collaborator
 
         if isinstance(collaborator, github.NamedUser.NamedUser):
@@ -2877,8 +2820,7 @@ class Repository(github.GithubObject.CompletableGithubObject):
     def _legacy_convert_issue(self, attributes):
         convertedAttributes = {
             "number": attributes["number"],
-            "url": "/repos"
-            + six.moves.urllib.parse.urlparse(attributes["html_url"]).path,
+            "url": "/repos" + urllib.parse.urlparse(attributes["html_url"]).path,
             "user": {
                 "login": attributes["user"],
                 "url": "/users/" + attributes["user"],
@@ -2901,7 +2843,7 @@ class Repository(github.GithubObject.CompletableGithubObject):
         :rtype: :class:`github.PaginatedList.PaginatedList` of :class:`github.Issue.Issue`
         """
         assert state in ["open", "closed"], state
-        assert isinstance(keyword, (str, six.text_type)), keyword
+        assert isinstance(keyword, str), keyword
         headers, data = self._requester.requestJsonAndCheck(
             "GET",
             "/legacy/issues/search/"
@@ -2911,7 +2853,7 @@ class Repository(github.GithubObject.CompletableGithubObject):
             + "/"
             + state
             + "/"
-            + six.moves.urllib.parse.quote(keyword),
+            + urllib.parse.quote(keyword),
         )
         return [
             github.Issue.Issue(
@@ -2987,10 +2929,10 @@ class Repository(github.GithubObject.CompletableGithubObject):
         :param commit_message: string
         :rtype: :class:`github.Commit.Commit`
         """
-        assert isinstance(base, (str, six.text_type)), base
-        assert isinstance(head, (str, six.text_type)), head
+        assert isinstance(base, str), base
+        assert isinstance(head, str), head
         assert commit_message is github.GithubObject.NotSet or isinstance(
-            commit_message, (str, six.text_type)
+            commit_message, str
         ), commit_message
         post_parameters = {
             "base": base,
@@ -3087,7 +3029,7 @@ class Repository(github.GithubObject.CompletableGithubObject):
         :rtype: None
         """
         assert isinstance(collaborator, github.NamedUser.NamedUser) or isinstance(
-            collaborator, (str, six.text_type)
+            collaborator, str
         ), collaborator
 
         if isinstance(collaborator, github.NamedUser.NamedUser):
@@ -3118,12 +3060,10 @@ class Repository(github.GithubObject.CompletableGithubObject):
         return self._hub("unsubscribe", event, callback, github.GithubObject.NotSet)
 
     def _hub(self, mode, event, callback, secret):
-        assert isinstance(mode, (str, six.text_type)), mode
-        assert isinstance(event, (str, six.text_type)), event
-        assert isinstance(callback, (str, six.text_type)), callback
-        assert secret is github.GithubObject.NotSet or isinstance(
-            secret, (str, six.text_type)
-        ), secret
+        assert isinstance(mode, str), mode
+        assert isinstance(event, str), event
+        assert isinstance(callback, str), callback
+        assert secret is github.GithubObject.NotSet or isinstance(secret, str), secret
 
         post_parameters = collections.OrderedDict()
         post_parameters["hub.callback"] = callback
diff --git a/github/RepositoryKey.py b/github/RepositoryKey.py
index 7ec47e49..11dba434 100644
--- a/github/RepositoryKey.py
+++ b/github/RepositoryKey.py
@@ -35,8 +35,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.GithubObject
 
 
diff --git a/github/Requester.py b/github/Requester.py
index f253f0f3..71a7d192 100644
--- a/github/Requester.py
+++ b/github/Requester.py
@@ -52,8 +52,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import base64
 import json
 import logging
@@ -61,11 +59,10 @@ import mimetypes
 import os
 import re
 import time
+import urllib
 from io import IOBase
 
 import requests
-import six
-import six.moves.urllib.parse
 
 from . import Consts, GithubException
 
@@ -78,7 +75,7 @@ class RequestsResponse:
         self.text = r.text
 
     def getheaders(self):
-        return six.iteritems(self.headers)
+        return self.headers.items()
 
     def read(self):
         return self.text
@@ -286,7 +283,7 @@ class Requester:
             self.__authorizationHeader = None
 
         self.__base_url = base_url
-        o = six.moves.urllib.parse.urlparse(base_url)
+        o = urllib.parse.urlparse(base_url)
         self.__hostname = o.hostname
         self.__port = o.port
         self.__prefix = o.path
@@ -348,7 +345,7 @@ class Requester:
     def __customConnection(self, url):
         cnx = None
         if not url.startswith("/"):
-            o = six.moves.urllib.parse.urlparse(url)
+            o = urllib.parse.urlparse(url)
             if (
                 o.hostname != self.__hostname
                 or (o.port and o.port != self.__port)
@@ -420,7 +417,7 @@ class Requester:
             eol = "\r\n"
 
             encoded_input = ""
-            for name, value in six.iteritems(input):
+            for name, value in input.items():
                 encoded_input += "--" + boundary + eol
                 encoded_input += (
                     'Content-Disposition: form-data; name="' + name + '"' + eol
@@ -518,7 +515,7 @@ class Requester:
             return self.__requestRaw(original_cnx, verb, url, requestHeaders, input)
 
         if status == 301 and "location" in responseHeaders:
-            o = six.moves.urllib.parse.urlparse(responseHeaders["location"])
+            o = urllib.parse.urlparse(responseHeaders["location"])
             return self.__requestRaw(original_cnx, verb, o.path, requestHeaders, input)
 
         return status, responseHeaders, output
@@ -536,7 +533,7 @@ class Requester:
         if url.startswith("/"):
             url = self.__prefix + url
         else:
-            o = six.moves.urllib.parse.urlparse(url)
+            o = urllib.parse.urlparse(url)
             assert o.hostname in [
                 self.__hostname,
                 "uploads.github.com",
@@ -553,7 +550,7 @@ class Requester:
         if len(parameters) == 0:
             return url
         else:
-            return url + "?" + six.moves.urllib.parse.urlencode(parameters)
+            return url + "?" + urllib.parse.urlencode(parameters)
 
     def __createConnection(self):
         kwds = {}
diff --git a/github/RequiredPullRequestReviews.py b/github/RequiredPullRequestReviews.py
index daaf2483..34b8ce43 100644
--- a/github/RequiredPullRequestReviews.py
+++ b/github/RequiredPullRequestReviews.py
@@ -22,8 +22,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.GithubObject
 import github.NamedUser
 import github.Team
diff --git a/github/RequiredStatusChecks.py b/github/RequiredStatusChecks.py
index 94d74a48..e4fba2e1 100644
--- a/github/RequiredStatusChecks.py
+++ b/github/RequiredStatusChecks.py
@@ -22,8 +22,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.GithubObject
 
 
diff --git a/github/SourceImport.py b/github/SourceImport.py
index 2eef55e9..a7c46248 100644
--- a/github/SourceImport.py
+++ b/github/SourceImport.py
@@ -22,8 +22,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.GithubObject
 from github import Consts
 
diff --git a/github/Stargazer.py b/github/Stargazer.py
index 3982caf9..71f51705 100644
--- a/github/Stargazer.py
+++ b/github/Stargazer.py
@@ -26,8 +26,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github
 
 
diff --git a/github/StatsCodeFrequency.py b/github/StatsCodeFrequency.py
index ab41868a..aab58812 100755
--- a/github/StatsCodeFrequency.py
+++ b/github/StatsCodeFrequency.py
@@ -26,8 +26,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.GithubObject
 
 
diff --git a/github/StatsCommitActivity.py b/github/StatsCommitActivity.py
index 714e94f8..ade32342 100755
--- a/github/StatsCommitActivity.py
+++ b/github/StatsCommitActivity.py
@@ -26,8 +26,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.GithubObject
 
 
diff --git a/github/StatsContributor.py b/github/StatsContributor.py
index 0bbb248b..0f974a2a 100755
--- a/github/StatsContributor.py
+++ b/github/StatsContributor.py
@@ -26,8 +26,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.GithubObject
 import github.NamedUser
 
diff --git a/github/StatsParticipation.py b/github/StatsParticipation.py
index 60a64ceb..546b7784 100755
--- a/github/StatsParticipation.py
+++ b/github/StatsParticipation.py
@@ -26,8 +26,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.GithubObject
 
 
diff --git a/github/StatsPunchCard.py b/github/StatsPunchCard.py
index a9742d90..e602345a 100755
--- a/github/StatsPunchCard.py
+++ b/github/StatsPunchCard.py
@@ -26,8 +26,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.GithubObject
 import github.NamedUser  # TODO remove unused
 
diff --git a/github/Tag.py b/github/Tag.py
index 1f60de70..65a601b2 100644
--- a/github/Tag.py
+++ b/github/Tag.py
@@ -31,8 +31,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.Commit
 import github.GithubObject
 
diff --git a/github/Team.py b/github/Team.py
index 8c28a758..047438fa 100644
--- a/github/Team.py
+++ b/github/Team.py
@@ -41,10 +41,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
-import six
-
 import github.GithubObject
 import github.NamedUser
 import github.Organization
@@ -181,9 +177,7 @@ class Team(github.GithubObject.CompletableGithubObject):
         :rtype: None
         """
         assert isinstance(member, github.NamedUser.NamedUser), member
-        assert role is github.GithubObject.NotSet or isinstance(
-            role, (str, six.text_type)
-        ), role
+        assert role is github.GithubObject.NotSet or isinstance(role, str), role
         if role is not github.GithubObject.NotSet:
             assert role in ["member", "maintainer"]
             put_parameters = {
@@ -245,15 +239,15 @@ class Team(github.GithubObject.CompletableGithubObject):
         :param privacy: string
         :rtype: None
         """
-        assert isinstance(name, (str, six.text_type)), name
+        assert isinstance(name, str), name
         assert description is github.GithubObject.NotSet or isinstance(
-            description, (str, six.text_type)
+            description, str
         ), description
         assert permission is github.GithubObject.NotSet or isinstance(
-            permission, (str, six.text_type)
+            permission, str
         ), permission
         assert privacy is github.GithubObject.NotSet or isinstance(
-            privacy, (str, six.text_type)
+            privacy, str
         ), privacy
         post_parameters = {
             "name": name,
@@ -288,9 +282,7 @@ class Team(github.GithubObject.CompletableGithubObject):
         :param role: string
         :rtype: :class:`github.PaginatedList.PaginatedList` of :class:`github.NamedUser.NamedUser`
         """
-        assert role is github.GithubObject.NotSet or isinstance(
-            role, (str, six.text_type)
-        ), role
+        assert role is github.GithubObject.NotSet or isinstance(role, str), role
         url_parameters = dict()
         if role is not github.GithubObject.NotSet:
             assert role in ["member", "maintainer", "all"]
diff --git a/github/TeamDiscussion.py b/github/TeamDiscussion.py
index cd1ddf4f..207ebe4e 100644
--- a/github/TeamDiscussion.py
+++ b/github/TeamDiscussion.py
@@ -22,7 +22,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
 
 import github.GithubObject
 import github.NamedUser
diff --git a/github/Topic.py b/github/Topic.py
index cdee4214..bb5aaffb 100644
--- a/github/Topic.py
+++ b/github/Topic.py
@@ -22,8 +22,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.GithubObject
 
 
diff --git a/github/UserKey.py b/github/UserKey.py
index c18a60d4..d8ff31b9 100644
--- a/github/UserKey.py
+++ b/github/UserKey.py
@@ -31,8 +31,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.GithubObject
 
 
diff --git a/github/View.py b/github/View.py
index 0c7b6547..d0180543 100644
--- a/github/View.py
+++ b/github/View.py
@@ -26,8 +26,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.GithubObject
 
 
diff --git a/github/__init__.py b/github/__init__.py
index d6fe13e6..3bf517b1 100644
--- a/github/__init__.py
+++ b/github/__init__.py
@@ -37,8 +37,6 @@ like :class:`github.NamedUser.NamedUser` or :class:`github.Repository.Repository
 All classes inherit from :class:`github.GithubObject.GithubObject`.
 """
 
-from __future__ import absolute_import
-
 import logging
 
 from github.MainClass import Github, GithubIntegration
diff --git a/manage.sh b/manage.sh
index b6c6e089..2d65667d 100755
--- a/manage.sh
+++ b/manage.sh
@@ -18,19 +18,10 @@ function fix_headers {
 }
 
 function test {
-    test2
-    test3
-}
-
-function test2 {
     coverage run --branch --include=github/*.py --omit=github/tests/*.py setup.py test --quiet || exit
     coverage report --show-missing || exit
 }
 
-function test3 {
-    python3 setup.py test --quiet || exit
-}
-
 function bump {
     previousVersion=$( grep '^version =' setup.py | sed 's/version = \"\(.*\)\"/\1/' )
     echo "Next version number? (previous: '$previousVersion')"
diff --git a/requirements.txt b/requirements.txt
index e29381df..d678b9ff 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,5 @@
 requests>=2.14.0
 pyjwt
-six
 sphinx<1.8
 sphinx-rtd-theme<0.5
 Deprecated
diff --git a/scripts/add_attribute.py b/scripts/add_attribute.py
index 18ad75b7..b905ca2d 100644
--- a/scripts/add_attribute.py
+++ b/scripts/add_attribute.py
@@ -28,8 +28,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import os.path
 import sys
 
@@ -41,35 +39,11 @@ else:
 
 
 types = {
-    "string": (
-        "string",
-        None,
-        'self._makeStringAttribute(attributes["' + attributeName + '"])',
-    ),
-    "int": (
-        "integer",
-        None,
-        'self._makeIntAttribute(attributes["' + attributeName + '"])',
-    ),
-    "bool": (
-        "bool",
-        None,
-        'self._makeBoolAttribute(attributes["' + attributeName + '"])',
-    ),
-    "datetime": (
-        "datetime.datetime",
-        "(str, unicode)",
-        'self._makeDatetimeAttribute(attributes["' + attributeName + '"])',
-    ),
-    "class": (
-        ":class:`" + attributeClassType + "`",
-        None,
-        "self._makeClassAttribute("
-        + attributeClassType
-        + ', attributes["'
-        + attributeName
-        + '"])',
-    ),
+    "string": ("string", None, "self._makeStringAttribute(attributes[\"" + attributeName + "\"])"),
+    "int": ("integer", None, "self._makeIntAttribute(attributes[\"" + attributeName + "\"])"),
+    "bool": ("bool", None, "self._makeBoolAttribute(attributes[\"" + attributeName + "\"])"),
+    "datetime": ("datetime.datetime", "(str, unicode)", "self._makeDatetimeAttribute(attributes[\"" + attributeName + "\"])"),
+    "class": (":class:`" + attributeClassType + "`", None, "self._makeClassAttribute(" + attributeClassType + ", attributes[\"" + attributeName + "\"])"),
 }
 
 attributeDocType, attributeAssertType, attributeValue = types[attributeType]
@@ -99,19 +73,15 @@ while not added:
     elif line.startswith("    def "):
         attrName = line[8:-7]
         # Properties will be inserted after __repr__, but before any other function.
-        if attrName != "__repr__" and (
-            attrName == "_identity" or attrName > attributeName or not isProperty
-        ):
+        if attrName != "__repr__" and (attrName == "_identity" or attrName > attributeName or not isProperty):
             if not isProperty:
                 newLines.append("    @property")
             newLines.append("    def " + attributeName + "(self):")
-            newLines.append('        """')
+            newLines.append("        \"\"\"")
             newLines.append("        :type: " + attributeDocType)
-            newLines.append('        """')
+            newLines.append("        \"\"\"")
             if isCompletable:
-                newLines.append(
-                    "        self._completeIfNotSet(self._" + attributeName + ")"
-                )
+                newLines.append("        self._completeIfNotSet(self._" + attributeName + ")")
             newLines.append("        return self._" + attributeName + ".value")
             newLines.append("")
             if isProperty:
@@ -133,9 +103,7 @@ while not added:
             if line:
                 attrName = line[14:-29]
             if not line or attrName > attributeName:
-                newLines.append(
-                    "        self._" + attributeName + " = github.GithubObject.NotSet"
-                )
+                newLines.append("        self._" + attributeName + " = github.GithubObject.NotSet")
                 added = True
     newLines.append(line)
 
@@ -155,26 +123,10 @@ while not added:
             if line:
                 attrName = line[12:-36]
             if not line or attrName > attributeName:
-                newLines.append(
-                    '        if "'
-                    + attributeName
-                    + '" in attributes:  # pragma no branch'
-                )
+                newLines.append("        if \"" + attributeName + "\" in attributes:  # pragma no branch")
                 if attributeAssertType:
-                    newLines.append(
-                        '            assert attributes["'
-                        + attributeName
-                        + '"] is None or isinstance(attributes["'
-                        + attributeName
-                        + '"], '
-                        + attributeAssertType
-                        + '), attributes["'
-                        + attributeName
-                        + '"]'
-                    )
-                newLines.append(
-                    "            self._" + attributeName + " = " + attributeValue
-                )
+                    newLines.append("            assert attributes[\"" + attributeName + "\"] is None or isinstance(attributes[\"" + attributeName + "\"], " + attributeAssertType + "), attributes[\"" + attributeName + "\"]")
+                newLines.append("            self._" + attributeName + " = " + attributeValue)
                 added = True
     newLines.append(line)
 
diff --git a/scripts/fix_headers.py b/scripts/fix_headers.py
index 1e71479d..ff6a3c0e 100755
--- a/scripts/fix_headers.py
+++ b/scripts/fix_headers.py
@@ -26,8 +26,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import, print_function
-
 import os
 import subprocess
 
@@ -63,9 +61,7 @@ def generateLicenseSection(filename):
 
 def listContributors(filename):
     contributors = set()
-    for line in subprocess.check_output(
-        ["git", "log", "--format=format:%ad %an <%ae>", "--date=short", "--", filename]
-    ).split("\n"):
+    for line in subprocess.check_output(["git", "log", "--format=format:%ad %an <%ae>", "--date=short", "--", filename]).split("\n"):
         year = line[0:4]
         name = line[11:]
         contributors.add((year, name))
@@ -109,11 +105,7 @@ class PythonHeader:
 
         if len(bodyLines) > 0 and bodyLines[0] != "":
             newLines.append("")
-            if (
-                "import " not in bodyLines[0]
-                and bodyLines[0] != '"""'
-                and not bodyLines[0].startswith("##########")
-            ):
+            if "import " not in bodyLines[0] and bodyLines[0] != '"""' and not bodyLines[0].startswith("##########"):
                 newLines.append("")
         newLines += bodyLines
 
@@ -137,7 +129,7 @@ class StandardHeader:
 
 
 def findHeadersAndFiles():
-    for root, dirs, files in os.walk(".", topdown=True):
+    for root, dirs, files in os.walk('.', topdown=True):
         if ".git" in dirs:
             dirs.remove(".git")
         if "developer.github.com" in dirs:
diff --git a/setup.py b/setup.py
index 704f3f7e..1f123faa 100755
--- a/setup.py
+++ b/setup.py
@@ -41,22 +41,12 @@
 #                                                                              #
 ################################################################################
 
-import sys
 import textwrap
 
 import setuptools
 
 version = "1.45"
 
-tests_require = [
-    "cryptography",
-    "httpretty>=0.9.6",
-    "parameterized>=0.7.0",
-]
-
-if sys.version_info < (3, 3):
-    tests_require.append("mock==3.0.5")
-
 
 if __name__ == "__main__":
     setuptools.setup(
@@ -101,8 +91,6 @@ if __name__ == "__main__":
             "License :: OSI Approved :: GNU Library or Lesser General Public License (LGPL)",
             "Operating System :: OS Independent",
             "Programming Language :: Python",
-            "Programming Language :: Python :: 2",
-            "Programming Language :: Python :: 2.7",
             "Programming Language :: Python :: 3",
             "Programming Language :: Python :: 3.5",
             "Programming Language :: Python :: 3.6",
@@ -111,8 +99,8 @@ if __name__ == "__main__":
             "Topic :: Software Development",
         ],
         test_suite="tests.AllTests",
-        python_requires=">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*",
-        install_requires=["deprecated", "pyjwt", "requests>=2.14.0", "six"],
+        python_requires=">=3.5",
+        install_requires=["deprecated", "pyjwt", "requests>=2.14.0"],
         extras_require={"integrations": ["cryptography"]},
-        tests_require=tests_require,
+        tests_require=["cryptography", "httpretty>=0.9.6", "parameterized>=0.7.0"],
     )
diff --git a/test-requirements.txt b/test-requirements.txt
index b5327a5e..48a0d018 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,4 +1,3 @@
 cryptography
 httpretty>=0.9.6
-mock==3.0.5; python_version < '3.3'
 parameterized>=0.7.0
diff --git a/tests/AllTests.py b/tests/AllTests.py
index 4b83a250..1c26b239 100644
--- a/tests/AllTests.py
+++ b/tests/AllTests.py
@@ -40,7 +40,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
 
 from .AuthenticatedUser import AuthenticatedUser
 from .Authentication import Authentication
diff --git a/tests/AuthenticatedUser.py b/tests/AuthenticatedUser.py
index 9137b30c..6aacb1e0 100644
--- a/tests/AuthenticatedUser.py
+++ b/tests/AuthenticatedUser.py
@@ -32,8 +32,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import datetime
 
 import github
diff --git a/tests/Authentication.py b/tests/Authentication.py
index a38fec52..0cafc8fd 100644
--- a/tests/Authentication.py
+++ b/tests/Authentication.py
@@ -28,8 +28,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github
 
 from . import Framework
diff --git a/tests/Authorization.py b/tests/Authorization.py
index 434d4ec9..54e91878 100644
--- a/tests/Authorization.py
+++ b/tests/Authorization.py
@@ -27,8 +27,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import datetime
 
 from . import Framework
diff --git a/tests/BadAttributes.py b/tests/BadAttributes.py
index ed474b30..7b48fe90 100755
--- a/tests/BadAttributes.py
+++ b/tests/BadAttributes.py
@@ -26,12 +26,8 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import datetime
 
-import six
-
 import github
 
 from . import Framework
@@ -46,7 +42,7 @@ class BadAttributes(Framework.TestCase):
         with self.assertRaises(github.BadAttributeException) as raisedexp:
             user.name
         self.assertEqual(raisedexp.exception.actual_value, 42)
-        self.assertEqual(raisedexp.exception.expected_type, (str, six.text_type))
+        self.assertEqual(raisedexp.exception.expected_type, str)
         self.assertEqual(raisedexp.exception.transformation_exception, None)
 
     def testBadAttributeTransformation(self):
@@ -56,7 +52,7 @@ class BadAttributes(Framework.TestCase):
         with self.assertRaises(github.BadAttributeException) as raisedexp:
             user.created_at
         self.assertEqual(raisedexp.exception.actual_value, "foobar")
-        self.assertEqual(raisedexp.exception.expected_type, (str, six.text_type))
+        self.assertEqual(raisedexp.exception.expected_type, str)
         self.assertEqual(
             raisedexp.exception.transformation_exception.__class__, ValueError
         )
@@ -72,7 +68,7 @@ class BadAttributes(Framework.TestCase):
         with self.assertRaises(github.BadAttributeException) as raisedexp:
             user.updated_at
         self.assertEqual(raisedexp.exception.actual_value, 42)
-        self.assertEqual(raisedexp.exception.expected_type, (str, six.text_type))
+        self.assertEqual(raisedexp.exception.expected_type, str)
         self.assertEqual(raisedexp.exception.transformation_exception, None)
 
     def testBadSimpleAttributeInList(self):
@@ -82,7 +78,7 @@ class BadAttributes(Framework.TestCase):
         with self.assertRaises(github.BadAttributeException) as raisedexp:
             hook.events
         self.assertEqual(raisedexp.exception.actual_value, ["push", 42])
-        self.assertEqual(raisedexp.exception.expected_type, [(str, six.text_type)])
+        self.assertEqual(raisedexp.exception.expected_type, [str])
         self.assertEqual(raisedexp.exception.transformation_exception, None)
 
     def testBadAttributeInClassAttribute(self):
@@ -111,9 +107,7 @@ class BadAttributes(Framework.TestCase):
         with self.assertRaises(github.BadAttributeException) as raisedexp:
             gist.files
         self.assertEqual(raisedexp.exception.actual_value, {"test.py": 42})
-        self.assertEqual(
-            raisedexp.exception.expected_type, {(str, six.text_type): dict}
-        )
+        self.assertEqual(raisedexp.exception.expected_type, {str: dict})
         self.assertEqual(raisedexp.exception.transformation_exception, None)
 
     def testIssue195(self):
@@ -302,5 +296,5 @@ class BadAttributes(Framework.TestCase):
                 ]
             ],
         )
-        self.assertEqual(raisedexp.exception.expected_type, [(str, six.text_type)])
+        self.assertEqual(raisedexp.exception.expected_type, [str])
         self.assertEqual(raisedexp.exception.transformation_exception, None)
diff --git a/tests/Branch.py b/tests/Branch.py
index 66b2dc09..4623c338 100644
--- a/tests/Branch.py
+++ b/tests/Branch.py
@@ -30,8 +30,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github
 
 from . import Framework
diff --git a/tests/BranchProtection.py b/tests/BranchProtection.py
index 769d96b1..eba5c57e 100644
--- a/tests/BranchProtection.py
+++ b/tests/BranchProtection.py
@@ -22,8 +22,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 from . import Framework
 
 
diff --git a/tests/Commit.py b/tests/Commit.py
index d8b29fdc..f61613ef 100644
--- a/tests/Commit.py
+++ b/tests/Commit.py
@@ -29,10 +29,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
-import six
-
 from . import Framework
 
 
@@ -64,7 +60,7 @@ class Commit(Framework.TestCase):
         self.assertEqual(
             self.commit.files[0].filename, "github/GithubObjects/GitAuthor.py"
         )
-        self.assertTrue(isinstance(self.commit.files[0].patch, (str, six.text_type)))
+        self.assertTrue(isinstance(self.commit.files[0].patch, str))
         self.assertEqual(
             self.commit.files[0].raw_url,
             "https://github.com/jacquev6/PyGithub/raw/1292bf0e22c796e91cc3d6e24b544aece8c21f2a/github/GithubObjects/GitAuthor.py",
diff --git a/tests/CommitCombinedStatus.py b/tests/CommitCombinedStatus.py
index e8fae897..1f9db98b 100644
--- a/tests/CommitCombinedStatus.py
+++ b/tests/CommitCombinedStatus.py
@@ -26,8 +26,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import datetime
 
 from . import Framework
diff --git a/tests/CommitComment.py b/tests/CommitComment.py
index 49911db7..2fbaf360 100644
--- a/tests/CommitComment.py
+++ b/tests/CommitComment.py
@@ -29,8 +29,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import datetime
 
 from . import Framework
diff --git a/tests/CommitStatus.py b/tests/CommitStatus.py
index 84c76d5a..19c35ceb 100644
--- a/tests/CommitStatus.py
+++ b/tests/CommitStatus.py
@@ -30,8 +30,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import datetime
 
 from . import Framework
diff --git a/tests/ConditionalRequestUpdate.py b/tests/ConditionalRequestUpdate.py
index 16c7acfb..0a0c31a7 100644
--- a/tests/ConditionalRequestUpdate.py
+++ b/tests/ConditionalRequestUpdate.py
@@ -27,8 +27,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 from . import Framework
 
 
diff --git a/tests/Connection.py b/tests/Connection.py
index f3d1db07..ab541760 100644
--- a/tests/Connection.py
+++ b/tests/Connection.py
@@ -22,23 +22,17 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
 
 import itertools
 import unittest
 from io import StringIO
+from unittest.mock import Mock
 
 import httpretty
 from parameterized import parameterized
 
 from . import Framework
 
-try:
-    from unittest.mock import Mock
-except ImportError:
-    from mock import Mock
-
-
 PARAMETERS = itertools.product(
     [
         (Framework.ReplayingHttpConnection, "http"),
diff --git a/tests/ContentFile.py b/tests/ContentFile.py
index 4b4719a4..e1286929 100644
--- a/tests/ContentFile.py
+++ b/tests/ContentFile.py
@@ -30,8 +30,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 from . import Framework
 
 
diff --git a/tests/Download.py b/tests/Download.py
index bf258b60..3beea0e9 100644
--- a/tests/Download.py
+++ b/tests/Download.py
@@ -28,8 +28,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import datetime
 
 from . import Framework
diff --git a/tests/Enterprise.py b/tests/Enterprise.py
index 35627947..772eb88a 100644
--- a/tests/Enterprise.py
+++ b/tests/Enterprise.py
@@ -27,8 +27,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github
 
 from . import Framework
@@ -90,9 +88,7 @@ class Enterprise(Framework.BasicTestCase):
             ],
         )
 
-    def testUnknownUrlScheme(
-        self,
-    ):  # To stay compatible with Python 2.6, we do not use self.assertRaises with only one argument
+    def testUnknownUrlScheme(self):
         with self.assertRaises(AssertionError) as raisedexp:
             github.Github(
                 self.login, self.password, base_url="foobar://my.enterprise.com"
diff --git a/tests/Equality.py b/tests/Equality.py
index 223f1b41..b0cc3644 100755
--- a/tests/Equality.py
+++ b/tests/Equality.py
@@ -25,8 +25,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 from . import Framework
 
 
diff --git a/tests/Event.py b/tests/Event.py
index 973461c9..acfaab50 100644
--- a/tests/Event.py
+++ b/tests/Event.py
@@ -28,8 +28,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import datetime
 
 from . import Framework
diff --git a/tests/Exceptions.py b/tests/Exceptions.py
index bed594c8..eb9531b6 100644
--- a/tests/Exceptions.py
+++ b/tests/Exceptions.py
@@ -31,12 +31,8 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import pickle
 
-from six.moves import range
-
 import github
 from github.GithubException import IncompletableObject
 
diff --git a/tests/ExposeAllAttributes.py b/tests/ExposeAllAttributes.py
index 23550640..161b617f 100644
--- a/tests/ExposeAllAttributes.py
+++ b/tests/ExposeAllAttributes.py
@@ -25,10 +25,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import, print_function
-
-import six
-
 from . import Framework
 
 
@@ -136,10 +132,8 @@ class ExposeAllAttributes(Framework.TestCase):
             ]
         )
 
-        for className, attributesMissingInClass in sorted(
-            six.iteritems(missingAttributes)
-        ):
-            for attrName, value in sorted(six.iteritems(attributesMissingInClass)):
+        for className, attributesMissingInClass in sorted(missingAttributes.items()):
+            for attrName, value in sorted(attributesMissingInClass.items()):
                 print(className, attrName, "->", repr(value))
 
         self.assertEqual(sum(len(attrs) for attrs in missingAttributes.values()), 0)
diff --git a/tests/Framework.py b/tests/Framework.py
index e49fde84..4a417c3e 100644
--- a/tests/Framework.py
+++ b/tests/Framework.py
@@ -36,8 +36,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import, print_function
-
 import io
 import json
 import os
@@ -45,7 +43,6 @@ import traceback
 import unittest
 
 import httpretty
-import six
 from requests.structures import CaseInsensitiveDict
 from urllib3.util import Url
 
@@ -99,7 +96,6 @@ class RecordingConnection:
         self.__cnx = self._realConnection(host, port, *args, **kwds)
 
     def request(self, verb, url, input, headers):
-        print(verb, url, input, headers, end=" ")
         self.__cnx.request(verb, url, input, headers)
         # fixAuthorizationHeader changes the parameter directly to remove Authorization token.
         # however, this is the real dictionary that *will be sent* by "requests",
@@ -116,7 +112,7 @@ class RecordingConnection:
         self.__writeLine(self.__port)
         self.__writeLine(url)
         self.__writeLine(anonymous_headers)
-        self.__writeLine(six.text_type(input).replace("\n", "").replace("\r", ""))
+        self.__writeLine(str(input).replace("\n", "").replace("\r", ""))
 
     def getresponse(self):
         res = self.__cnx.getresponse()
@@ -137,7 +133,7 @@ class RecordingConnection:
         return self.__cnx.close()
 
     def __writeLine(self, line):
-        self.__file.write(six.text_type(line) + u"\n")
+        self.__file.write(str(line) + u"\n")
 
 
 class RecordingHttpConnection(RecordingConnection):
@@ -185,7 +181,7 @@ class ReplayingConnection:
         )
         self.__testCase.assertEqual(headers, eval(readLine(self.__file)))
         expectedInput = readLine(self.__file)
-        if isinstance(input, (str, six.text_type)):
+        if isinstance(input, str):
             if input.startswith("{"):
                 self.__testCase.assertEqual(
                     json.loads(input.replace("\n", "").replace("\r", "")),
diff --git a/tests/Gist.py b/tests/Gist.py
index 1a422367..1b04099e 100644
--- a/tests/Gist.py
+++ b/tests/Gist.py
@@ -28,8 +28,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import datetime
 
 import github
diff --git a/tests/GistComment.py b/tests/GistComment.py
index 63aba8fd..c2638768 100644
--- a/tests/GistComment.py
+++ b/tests/GistComment.py
@@ -28,8 +28,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import datetime
 
 from . import Framework
diff --git a/tests/GitBlob.py b/tests/GitBlob.py
index c2f35c99..db7539bd 100644
--- a/tests/GitBlob.py
+++ b/tests/GitBlob.py
@@ -29,8 +29,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 from . import Framework
 
 
diff --git a/tests/GitCommit.py b/tests/GitCommit.py
index 93e1382b..cf43736e 100644
--- a/tests/GitCommit.py
+++ b/tests/GitCommit.py
@@ -29,8 +29,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import datetime
 
 from . import Framework
diff --git a/tests/GitMembership.py b/tests/GitMembership.py
index 00cf2502..5da9bd53 100644
--- a/tests/GitMembership.py
+++ b/tests/GitMembership.py
@@ -39,7 +39,6 @@
 # along with PyGithub. If not, see <http://www.gnu.org/licenses/>.             #
 #                                                                              #
 ################################################################################
-from __future__ import absolute_import
 
 from . import Framework
 
diff --git a/tests/GitRef.py b/tests/GitRef.py
index 2f83dbd7..8fc03854 100644
--- a/tests/GitRef.py
+++ b/tests/GitRef.py
@@ -28,8 +28,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 from . import Framework
 
 
diff --git a/tests/GitRelease.py b/tests/GitRelease.py
index f092fbaf..9a6d427b 100644
--- a/tests/GitRelease.py
+++ b/tests/GitRelease.py
@@ -34,8 +34,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import datetime
 import os
 import zipfile
diff --git a/tests/GitReleaseAsset.py b/tests/GitReleaseAsset.py
index e3c074d7..fbab8b1d 100644
--- a/tests/GitReleaseAsset.py
+++ b/tests/GitReleaseAsset.py
@@ -24,8 +24,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import datetime
 
 from . import Framework
diff --git a/tests/GitTag.py b/tests/GitTag.py
index 28e22183..13e5d5a9 100644
--- a/tests/GitTag.py
+++ b/tests/GitTag.py
@@ -29,8 +29,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import datetime
 
 from . import Framework
diff --git a/tests/GitTree.py b/tests/GitTree.py
index a0d57d3b..15b7c087 100644
--- a/tests/GitTree.py
+++ b/tests/GitTree.py
@@ -29,8 +29,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 from . import Framework
 
 
diff --git a/tests/GithubIntegration.py b/tests/GithubIntegration.py
index fabb0a26..24733fbb 100644
--- a/tests/GithubIntegration.py
+++ b/tests/GithubIntegration.py
@@ -1,5 +1,3 @@
-from __future__ import absolute_import
-
 import datetime
 import json
 import sys
diff --git a/tests/Github_.py b/tests/Github_.py
index 199f8108..0fdcc035 100644
--- a/tests/Github_.py
+++ b/tests/Github_.py
@@ -32,8 +32,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import datetime
 
 import github
diff --git a/tests/Hook.py b/tests/Hook.py
index 429f375d..b77b07bf 100644
--- a/tests/Hook.py
+++ b/tests/Hook.py
@@ -29,8 +29,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import datetime
 
 from . import Framework
diff --git a/tests/Issue.py b/tests/Issue.py
index 02aa5169..90744174 100644
--- a/tests/Issue.py
+++ b/tests/Issue.py
@@ -33,8 +33,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import datetime
 
 from . import Framework
diff --git a/tests/Issue131.py b/tests/Issue131.py
index c74e6484..938a2096 100644
--- a/tests/Issue131.py
+++ b/tests/Issue131.py
@@ -25,8 +25,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 from . import Framework
 
 
diff --git a/tests/Issue133.py b/tests/Issue133.py
index 85e2d8af..b9a3d2d5 100644
--- a/tests/Issue133.py
+++ b/tests/Issue133.py
@@ -25,8 +25,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 from . import Framework
 
 
diff --git a/tests/Issue134.py b/tests/Issue134.py
index be9034d9..9f10cc98 100644
--- a/tests/Issue134.py
+++ b/tests/Issue134.py
@@ -26,8 +26,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github
 
 from . import Framework
diff --git a/tests/Issue139.py b/tests/Issue139.py
index b746b84b..d6db6020 100644
--- a/tests/Issue139.py
+++ b/tests/Issue139.py
@@ -25,8 +25,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 from . import Framework
 
 
diff --git a/tests/Issue140.py b/tests/Issue140.py
index 8f18f7a2..49d9d19d 100644
--- a/tests/Issue140.py
+++ b/tests/Issue140.py
@@ -25,8 +25,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 from . import Framework
 
 
diff --git a/tests/Issue142.py b/tests/Issue142.py
index b35e6425..2278bdfc 100644
--- a/tests/Issue142.py
+++ b/tests/Issue142.py
@@ -25,7 +25,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
 
 import github
 
diff --git a/tests/Issue158.py b/tests/Issue158.py
index 04136ef1..c649c405 100644
--- a/tests/Issue158.py
+++ b/tests/Issue158.py
@@ -25,8 +25,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github
 
 from . import Framework
diff --git a/tests/Issue174.py b/tests/Issue174.py
index 5f526f83..535c0e3e 100644
--- a/tests/Issue174.py
+++ b/tests/Issue174.py
@@ -25,8 +25,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 from . import Framework
 
 
diff --git a/tests/Issue214.py b/tests/Issue214.py
index 2c376626..cfe41b54 100644
--- a/tests/Issue214.py
+++ b/tests/Issue214.py
@@ -25,8 +25,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 from . import Framework
 
 
diff --git a/tests/Issue216.py b/tests/Issue216.py
index c1d1a5af..8cc30a35 100644
--- a/tests/Issue216.py
+++ b/tests/Issue216.py
@@ -25,8 +25,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 from . import Framework
 
 
diff --git a/tests/Issue278.py b/tests/Issue278.py
index 6c28a70c..6e28cf1e 100644
--- a/tests/Issue278.py
+++ b/tests/Issue278.py
@@ -24,8 +24,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 from . import Framework
 
 
diff --git a/tests/Issue33.py b/tests/Issue33.py
index 42de4cec..f693dd0a 100644
--- a/tests/Issue33.py
+++ b/tests/Issue33.py
@@ -27,8 +27,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 from . import Framework
 
 
diff --git a/tests/Issue494.py b/tests/Issue494.py
index 6905afbb..21d57a42 100644
--- a/tests/Issue494.py
+++ b/tests/Issue494.py
@@ -23,8 +23,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 from . import Framework
 
 
diff --git a/tests/Issue50.py b/tests/Issue50.py
index da9d8cde..0f187f76 100644
--- a/tests/Issue50.py
+++ b/tests/Issue50.py
@@ -27,8 +27,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 from . import Framework
 
 
diff --git a/tests/Issue54.py b/tests/Issue54.py
index 3db5ed23..57995609 100644
--- a/tests/Issue54.py
+++ b/tests/Issue54.py
@@ -27,8 +27,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import datetime
 
 from . import Framework
diff --git a/tests/Issue572.py b/tests/Issue572.py
index 7ad2c4da..c6f601d0 100644
--- a/tests/Issue572.py
+++ b/tests/Issue572.py
@@ -22,8 +22,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github
 
 from . import Framework
diff --git a/tests/Issue80.py b/tests/Issue80.py
index 87099f8b..855f2250 100644
--- a/tests/Issue80.py
+++ b/tests/Issue80.py
@@ -27,8 +27,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github
 
 from . import Framework
diff --git a/tests/Issue823.py b/tests/Issue823.py
index cd77fd9b..22051184 100644
--- a/tests/Issue823.py
+++ b/tests/Issue823.py
@@ -25,8 +25,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 from . import Framework
 
 
diff --git a/tests/Issue87.py b/tests/Issue87.py
index 822c673e..0103a130 100644
--- a/tests/Issue87.py
+++ b/tests/Issue87.py
@@ -27,8 +27,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 from . import Framework
 
 
diff --git a/tests/Issue937.py b/tests/Issue937.py
index c4ddf068..43664312 100644
--- a/tests/Issue937.py
+++ b/tests/Issue937.py
@@ -17,14 +17,10 @@
 # FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more #
 # details.                                                                     #
 #                                                                              #
-
-
-#                                                                              #
-################################################################################
-from __future__ import absolute_import
-
 # You should have received a copy of the GNU Lesser General Public License     #
 # along with PyGithub. If not, see <http://www.gnu.org/licenses/>.             #
+#                                                                              #
+################################################################################
 from . import Framework
 
 
diff --git a/tests/Issue945.py b/tests/Issue945.py
index 59921294..3b6b4d63 100644
--- a/tests/Issue945.py
+++ b/tests/Issue945.py
@@ -22,8 +22,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 from . import Framework
 
 
diff --git a/tests/IssueComment.py b/tests/IssueComment.py
index 3f28aaa3..3ec1afe7 100644
--- a/tests/IssueComment.py
+++ b/tests/IssueComment.py
@@ -29,8 +29,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import datetime
 
 from . import Framework
diff --git a/tests/IssueEvent.py b/tests/IssueEvent.py
index 4fa262f1..aec4721b 100644
--- a/tests/IssueEvent.py
+++ b/tests/IssueEvent.py
@@ -29,8 +29,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import datetime
 
 from . import Framework
diff --git a/tests/Label.py b/tests/Label.py
index 60ecd4a2..b8a7fa29 100644
--- a/tests/Label.py
+++ b/tests/Label.py
@@ -29,8 +29,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 from . import Framework
 
 
diff --git a/tests/License.py b/tests/License.py
index 0f51a3a1..5a04dc39 100644
--- a/tests/License.py
+++ b/tests/License.py
@@ -22,8 +22,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 from . import Framework
 
 
diff --git a/tests/Logging_.py b/tests/Logging_.py
index d84d3312..6fea2746 100644
--- a/tests/Logging_.py
+++ b/tests/Logging_.py
@@ -29,8 +29,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github
 
 from . import Framework
diff --git a/tests/Markdown.py b/tests/Markdown.py
index 1870928f..02dd53ff 100644
--- a/tests/Markdown.py
+++ b/tests/Markdown.py
@@ -27,8 +27,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 from . import Framework
 
 
diff --git a/tests/Migration.py b/tests/Migration.py
index a05664fd..b5dcf95c 100644
--- a/tests/Migration.py
+++ b/tests/Migration.py
@@ -47,8 +47,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import datetime
 
 import github
diff --git a/tests/Milestone.py b/tests/Milestone.py
index 163a8f9e..4021b573 100644
--- a/tests/Milestone.py
+++ b/tests/Milestone.py
@@ -28,8 +28,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import datetime
 
 from . import Framework
diff --git a/tests/NamedUser.py b/tests/NamedUser.py
index f1e42898..2580e99c 100644
--- a/tests/NamedUser.py
+++ b/tests/NamedUser.py
@@ -31,8 +31,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import datetime
 
 from . import Framework
diff --git a/tests/Notification.py b/tests/Notification.py
index 5880dd96..e7454184 100644
--- a/tests/Notification.py
+++ b/tests/Notification.py
@@ -28,8 +28,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 from . import Framework
 
 
diff --git a/tests/Organization.py b/tests/Organization.py
index 71626edb..f79915d6 100644
--- a/tests/Organization.py
+++ b/tests/Organization.py
@@ -34,8 +34,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import datetime
 
 import github
diff --git a/tests/OrganizationHasInMembers.py b/tests/OrganizationHasInMembers.py
index 6b52ad46..86c4fe17 100644
--- a/tests/OrganizationHasInMembers.py
+++ b/tests/OrganizationHasInMembers.py
@@ -23,8 +23,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 from . import Framework
 
 
diff --git a/tests/PaginatedList.py b/tests/PaginatedList.py
index 45dd9764..52453818 100644
--- a/tests/PaginatedList.py
+++ b/tests/PaginatedList.py
@@ -29,8 +29,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 from github.PaginatedList import PaginatedList as PaginatedListImpl
 
 from . import Framework
diff --git a/tests/Persistence.py b/tests/Persistence.py
index 716d4671..d39ffe16 100644
--- a/tests/Persistence.py
+++ b/tests/Persistence.py
@@ -26,8 +26,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 from io import BytesIO as IO
 
 import github
diff --git a/tests/Project.py b/tests/Project.py
index 52d121c4..259a1dc1 100644
--- a/tests/Project.py
+++ b/tests/Project.py
@@ -22,8 +22,6 @@
 #                                                                              #
 # ##############################################################################
 
-from __future__ import absolute_import
-
 import github
 
 from . import Framework
diff --git a/tests/PullRequest.py b/tests/PullRequest.py
index f8eb9755..642e8c70 100644
--- a/tests/PullRequest.py
+++ b/tests/PullRequest.py
@@ -31,8 +31,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import datetime
 
 from . import Framework
diff --git a/tests/PullRequest1168.py b/tests/PullRequest1168.py
index 277895cd..e610d173 100644
--- a/tests/PullRequest1168.py
+++ b/tests/PullRequest1168.py
@@ -22,8 +22,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 from . import Framework
 
 
diff --git a/tests/PullRequest1169.py b/tests/PullRequest1169.py
index 112e646d..cbffbfb8 100644
--- a/tests/PullRequest1169.py
+++ b/tests/PullRequest1169.py
@@ -22,8 +22,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 from . import Framework
 
 
diff --git a/tests/PullRequestComment.py b/tests/PullRequestComment.py
index a215aeee..fe86c751 100644
--- a/tests/PullRequestComment.py
+++ b/tests/PullRequestComment.py
@@ -29,8 +29,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import datetime
 
 from . import Framework
diff --git a/tests/PullRequestFile.py b/tests/PullRequestFile.py
index 64c092ae..3ed6ca20 100644
--- a/tests/PullRequestFile.py
+++ b/tests/PullRequestFile.py
@@ -28,8 +28,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 from . import Framework
 
 
diff --git a/tests/PullRequestReview.py b/tests/PullRequestReview.py
index 8a024c2e..f252359f 100644
--- a/tests/PullRequestReview.py
+++ b/tests/PullRequestReview.py
@@ -26,8 +26,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import datetime
 
 from . import Framework
diff --git a/tests/RateLimiting.py b/tests/RateLimiting.py
index f2b1ebbc..f2270f30 100644
--- a/tests/RateLimiting.py
+++ b/tests/RateLimiting.py
@@ -28,8 +28,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import datetime
 
 from . import Framework
diff --git a/tests/RawData.py b/tests/RawData.py
index 690e1a22..18a2c753 100644
--- a/tests/RawData.py
+++ b/tests/RawData.py
@@ -25,8 +25,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import github.NamedUser
 
 from . import Framework
diff --git a/tests/Reaction.py b/tests/Reaction.py
index 9a0aa462..5b3307fd 100644
--- a/tests/Reaction.py
+++ b/tests/Reaction.py
@@ -23,8 +23,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import datetime
 
 from . import Framework
diff --git a/tests/Repository.py b/tests/Repository.py
index b55d37f7..4fbe32a9 100644
--- a/tests/Repository.py
+++ b/tests/Repository.py
@@ -47,8 +47,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import datetime
 
 import github
diff --git a/tests/RepositoryKey.py b/tests/RepositoryKey.py
index 96a0f1b6..6fbc07a8 100644
--- a/tests/RepositoryKey.py
+++ b/tests/RepositoryKey.py
@@ -31,8 +31,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import datetime
 
 from . import Framework
diff --git a/tests/RequiredPullRequestReviews.py b/tests/RequiredPullRequestReviews.py
index d69c5185..3840e9b9 100644
--- a/tests/RequiredPullRequestReviews.py
+++ b/tests/RequiredPullRequestReviews.py
@@ -22,8 +22,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 from . import Framework
 
 
diff --git a/tests/RequiredStatusChecks.py b/tests/RequiredStatusChecks.py
index 07f3b163..dabb7a0c 100644
--- a/tests/RequiredStatusChecks.py
+++ b/tests/RequiredStatusChecks.py
@@ -22,8 +22,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 from . import Framework
 
 
diff --git a/tests/Retry.py b/tests/Retry.py
index 80f8f6e7..621815e9 100644
--- a/tests/Retry.py
+++ b/tests/Retry.py
@@ -26,8 +26,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import requests
 import urllib3
 from httpretty import httpretty
diff --git a/tests/Search.py b/tests/Search.py
index cdc74929..befccbf4 100644
--- a/tests/Search.py
+++ b/tests/Search.py
@@ -26,8 +26,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 from . import Framework
 
 
diff --git a/tests/SourceImport.py b/tests/SourceImport.py
index 2a39aace..a8135370 100644
--- a/tests/SourceImport.py
+++ b/tests/SourceImport.py
@@ -22,8 +22,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 from . import Framework
 
 
diff --git a/tests/Tag.py b/tests/Tag.py
index 82a4a195..3a0cfd7b 100644
--- a/tests/Tag.py
+++ b/tests/Tag.py
@@ -28,8 +28,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 from . import Framework
 
 
diff --git a/tests/Team.py b/tests/Team.py
index 83163843..208156af 100644
--- a/tests/Team.py
+++ b/tests/Team.py
@@ -34,7 +34,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
 
 from datetime import datetime
 
diff --git a/tests/Time.py b/tests/Time.py
index fd9b9b33..4743eaa3 100644
--- a/tests/Time.py
+++ b/tests/Time.py
@@ -20,8 +20,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 from datetime import timedelta, tzinfo
 
 
diff --git a/tests/Topic.py b/tests/Topic.py
index 378e5bcb..629cdaab 100644
--- a/tests/Topic.py
+++ b/tests/Topic.py
@@ -22,7 +22,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
 
 from datetime import datetime
 from operator import attrgetter
diff --git a/tests/Traffic.py b/tests/Traffic.py
index c55e30b3..29189cd1 100644
--- a/tests/Traffic.py
+++ b/tests/Traffic.py
@@ -26,8 +26,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import datetime
 
 from . import Framework
diff --git a/tests/UserKey.py b/tests/UserKey.py
index 9d5d85c5..d47f3c14 100644
--- a/tests/UserKey.py
+++ b/tests/UserKey.py
@@ -29,8 +29,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 from . import Framework
 
 
diff --git a/tests/__main__.py b/tests/__main__.py
index 461aafc4..eadc5ba6 100644
--- a/tests/__main__.py
+++ b/tests/__main__.py
@@ -28,8 +28,6 @@
 #                                                                              #
 ################################################################################
 
-from __future__ import absolute_import
-
 import sys
 import unittest