[Lint] Fix Black and Flake8 issues

For a single element unpack black now also encloses with parentheses to
make it clearer: https://github.com/psf/black/issues/1108

Fix flake8 warnings

.pre-commit-config.yaml

@@ -6,20 +6,20 @@ exclude: >
   )$
 repos:
   - repo: https://github.com/ambv/black
-    rev: 19.3b0
+    rev: 19.10b0
     hooks:
       - id: black
         name: Fmt Black
         language_version: python3.6
   - repo: https://github.com/prettier/prettier
-    rev: 1.17.0
+    rev: 1.19.1
     hooks:
       - id: prettier
         name: Fmt Prettier
         # Workaround to list modified files only.
         args: [--list-different]
   - repo: https://gitlab.com/pycqa/flake8
-    rev: 3.7.7
+    rev: 3.7.9
     hooks:
       - id: flake8
         name: Chk Flake8
@@ -27,7 +27,7 @@ repos:
           - flake8-isort==2.7
           - pep8-naming==0.8.2
   - repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v2.2.1
+    rev: v2.4.0
     hooks:
       - id: double-quote-string-fixer
         name: Fix Double-quotes

deluge/argparserbase.py

@@ -122,7 +122,7 @@ class DelugeTextHelpFormatter(argparse.RawDescriptionHelpFormatter):
 
         """
         if not action.option_strings:
-            metavar, = self._metavar_formatter(action, action.dest)(1)
+            (metavar,) = self._metavar_formatter(action, action.dest)(1)
             return metavar
         else:
             parts = []

deluge/tests/test_security.py

@@ -28,11 +28,11 @@ SECURITY_TESTS = bool(os.getenv('SECURITY_TESTS', False))
 
 class SecurityBaseTestCase(object):
     if windows_check():
-        skip = 'windows can`t run .sh files'
+        skip = 'windows cannot run .sh files'
     elif not SECURITY_TESTS:
         skip = 'Skipping security tests'
 
-    http_err = 'can\'t run http tests on daemon'
+    http_err = 'cannot run http tests on daemon'
 
     def __init__(self):
         self.home_dir = os.path.expanduser('~')
@@ -132,7 +132,7 @@ class SecurityBaseTestCase(object):
 class DaemonSecurityTestCase(BaseTestCase, DaemonBase, SecurityBaseTestCase):
 
     if windows_check():
-        skip = 'windows can\'t start_core not enough arguments for format string'
+        skip = 'windows cannot start_core not enough arguments for format string'
 
     def __init__(self, testname):
         super(DaemonSecurityTestCase, self).__init__(testname)

deluge/tests/test_torrentmanager.py

@@ -82,7 +82,7 @@ class TorrentmanagerTestCase(BaseTestCase):
                 b'name': b'azcvsupdater_2.6.2.jar',
                 b'private': 0,
                 b'pieces': (
-                    b'\xdb\x04B\x05\xc3\'\xdab\xb8su97\xa9u'
+                    b"\xdb\x04B\x05\xc3'\xdab\xb8su97\xa9u"
                     b'\xca<w\\\x1ef\xd4\x9b\x16\xa9}\xc0\x9f:\xfd'
                     b'\x97qv\x83\xa2"\xef\x9d7\x0by!\rl\xe5v\xb7'
                     b'\x18{\xf7/"P\xe9\x8d\x01D\x9e8\xbd\x16\xe3'

deluge/ui/console/modes/add_util.py

@@ -16,7 +16,7 @@ import logging
 import os
 from base64 import b64encode
 
-from six import unichr as chr
+from six import unichr as chr  # noqa: A001 shadowing
 
 import deluge.common
 from deluge.ui.client import client

deluge/ui/countries.py

@@ -60,7 +60,7 @@ COUNTRIES = {
     'CD': _('Congo, The Democratic Republic of the'),
     'CK': _('Cook Islands'),
     'CR': _('Costa Rica'),
-    'CI': _('Cote d\'Ivoire'),
+    'CI': _("Cote d'Ivoire"),
     'HR': _('Croatia'),
     'CU': _('Cuba'),
     'CY': _('Cyprus'),
@@ -122,11 +122,11 @@ COUNTRIES = {
     'KZ': _('Kazakhstan'),
     'KE': _('Kenya'),
     'KI': _('Kiribati'),
-    'KP': _('Korea, Democratic People\'s Republic of'),
+    'KP': _("Korea, Democratic People's Republic of"),
     'KR': _('Korea, Republic of'),
     'KW': _('Kuwait'),
     'KG': _('Kyrgyzstan'),
-    'LA': _('Lao People\'s Democratic Republic'),
+    'LA': _("Lao People's Democratic Republic"),
     'LV': _('Latvia'),
     'LB': _('Lebanon'),
     'LS': _('Lesotho'),

deluge/ui/gtk3/mainwindow.py

@@ -277,12 +277,14 @@ class MainWindow(component.Component):
     def save_position(self):
         self.config['window_maximized'] = self.window.props.is_maximized
         if not self.config['window_maximized'] and self.visible():
-            self.config['window_x_pos'], self.config[
-                'window_y_pos'
-            ] = self.window.get_position()
-            self.config['window_width'], self.config[
-                'window_height'
-            ] = self.window.get_size()
+            (
+                self.config['window_x_pos'],
+                self.config['window_y_pos'],
+            ) = self.window.get_position()
+            (
+                self.config['window_width'],
+                self.config['window_height'],
+            ) = self.window.get_size()
 
     def on_window_configure_event(self, widget, event):
         self.save_position()

deluge/ui/gtk3/path_combo_chooser.py

@@ -538,9 +538,8 @@ class PathChooserPopup(object):
         self.set_max_popup_rows(max_visible_rows)
         self.popup_window.realize()
         self.alignment_widget = popup_alignment_widget
-        self.popup_buttonbox = (
-            None
-        )  # If set, the height of this widget is the minimum height
+        # If set, the height of this widget is the minimum height
+        self.popup_buttonbox = None
 
     def popup(self):
         """Make the popup visible."""