diff --git a/github/GithubObject.UnitTest.py b/github/GithubObject.UnitTest.py
index 83dee1ce..64c9f419 100644
--- a/github/GithubObject.UnitTest.py
+++ b/github/GithubObject.UnitTest.py
@@ -326,6 +326,7 @@ class GithubObjectWithElementCreatableExternalListOfObjects( TestCaseWithGithubT
         self.assertEqual( self.o.create_a3( "nameCreate", 1, 2 ).id, "idCreate" )
 
     def testCreateWithSillyArgument( self ):
+        self.g.expect._dataRequest.andReturn( None )
         with self.assertRaises( TypeError ):
             self.o.create_a3( foobar = 42 )
 
diff --git a/github/ObjectCapacities/List.py b/github/ObjectCapacities/List.py
index 4483d329..eef9745a 100644
--- a/github/ObjectCapacities/List.py
+++ b/github/ObjectCapacities/List.py
@@ -17,21 +17,36 @@ class ElementAddable( ListCapacity ):
         cls._addMethod( "add_to_" + self.safeAttributeName, self.__execute )
 
     def __execute( self, obj, toBeAdded ):
-        obj._github._statusRequest( "PUT", obj._baseUrl + "/" + self.attributeName + "/" + self.typePolicy.getIdentity( toBeAdded ), None, None )
+        obj._github._statusRequest(
+            "PUT",
+            obj._baseUrl + "/" + self.attributeName + "/" + self.typePolicy.getIdentity( toBeAdded ),
+            None,
+            None
+        )
 
 class ElementRemovable( ListCapacity ):
     def apply( self, cls ):
         cls._addMethod( "remove_from_" + self.safeAttributeName, self.__execute )
 
     def __execute( self, obj, toBeDeleted ):
-        obj._github._statusRequest( "DELETE", obj._baseUrl + "/" + self.attributeName + "/" + self.typePolicy.getIdentity( toBeDeleted ), None, None )
+        obj._github._statusRequest(
+            "DELETE",
+            obj._baseUrl + "/" + self.attributeName + "/" + self.typePolicy.getIdentity( toBeDeleted ),
+            None,
+            None
+        )
 
 class ElementHasable( ListCapacity ):
     def apply( self, cls ):
         cls._addMethod( "has_in_" + self.safeAttributeName, self.__execute )
 
     def __execute( self, obj, toBeQueried ):
-        return obj._github._statusRequest( "GET", obj._baseUrl + "/" + self.attributeName + "/" + self.typePolicy.getIdentity( toBeQueried ), None, None ) == 204
+        return obj._github._statusRequest(
+            "GET",
+            obj._baseUrl + "/" + self.attributeName + "/" + self.typePolicy.getIdentity( toBeQueried ),
+            None,
+            None
+        ) == 204
 
 class ElementCreatable( ListCapacity ):
     def __init__( self, mandatoryParameters, optionalParameters, attributeModifiers = {} ):
@@ -42,8 +57,18 @@ class ElementCreatable( ListCapacity ):
         cls._addMethod( "create_" + self.singularName, self.__execute )
 
     def __execute( self, obj, *args, **kwds ):
-        data = self.__argumentsChecker.check( args, kwds )
-        return self.typePolicy.createLazy( obj, self.__modifyAttributes( obj, obj._github._dataRequest( "POST", obj._baseUrl + "/" + self.attributeName, None, data ) ) )
+        return self.typePolicy.createLazy(
+            obj,
+            self.__modifyAttributes(
+                obj,
+                obj._github._dataRequest(
+                    "POST",
+                    obj._baseUrl + "/" + self.attributeName,
+                    None,
+                    self.__argumentsChecker.check( args, kwds )
+                )
+            )
+        )
 
     def __modifyAttributes( self, obj, attributes ):
         for attributeName, attributeModifier in self.__attributeModifiers.iteritems():
@@ -59,7 +84,13 @@ class ElementGetable( ListCapacity ):
         cls._addMethod( "get_" + self.singularName, self.__execute )
 
     def __execute( self, obj, *args, **kwds ):
-        return self.typePolicy.createNonLazy( obj, self.__modifyAttributes( obj, self.__argumentsChecker.check( args, kwds ) ) )
+        return self.typePolicy.createNonLazy(
+            obj,
+            self.__modifyAttributes(
+                obj,
+                self.__argumentsChecker.check( args, kwds )
+            )
+        )
 
     def __modifyAttributes( self, obj, attributes ):
         for attributeName, attributeModifier in self.__attributeModifiers.iteritems():
@@ -71,14 +102,30 @@ class SeveralElementsAddable( ListCapacity ):
         cls._addMethod( "add_to_" + self.safeAttributeName, self.__execute )
 
     def __execute( self, obj, *toBeAddeds ):
-        obj._github._statusRequest( "POST", obj._baseUrl + "/" + self.attributeName, None, [ self.typePolicy.getIdentity( toBeAdded ) for toBeAdded in toBeAddeds ] )
+        obj._github._statusRequest(
+            "POST",
+            obj._baseUrl + "/" + self.attributeName,
+            None,
+            [
+                self.typePolicy.getIdentity( toBeAdded )
+                for toBeAdded in toBeAddeds
+            ]
+        )
 
 class SeveralElementsRemovable( ListCapacity ):
     def apply( self, cls ):
         cls._addMethod( "remove_from_" + self.safeAttributeName, self.__execute )
 
     def __execute( self, obj, *toBeDeleteds ):
-        obj._github._statusRequest( "DELETE", obj._baseUrl + "/" + self.attributeName, None, [ self.typePolicy.getIdentity( toBeDeleted ) for toBeDeleted in toBeDeleteds ] )
+        obj._github._statusRequest(
+            "DELETE",
+            obj._baseUrl + "/" + self.attributeName,
+            None,
+            [
+                self.typePolicy.getIdentity( toBeDeleted )
+                for toBeDeleted in toBeDeleteds
+            ]
+        )
 
 class ListGetable( ListCapacity ):
     def __init__( self, mandatoryParameters, optionalParameters, attributeModifiers = {} ):
@@ -91,8 +138,16 @@ class ListGetable( ListCapacity ):
     def __execute( self, obj, *args, **kwds ):
         params = self.__argumentsChecker.check( args, kwds )
         return [
-            self.typePolicy.createLazy( obj, self.__modifyAttributes( obj, attributes ) )
-            for attributes in obj._github._dataRequest( "GET", obj._baseUrl + "/" + self.attributeName, params, None )
+            self.typePolicy.createLazy(
+                obj,
+                self.__modifyAttributes( obj, attributes )
+            )
+            for attributes in obj._github._dataRequest(
+                "GET",
+                obj._baseUrl + "/" + self.attributeName,
+                params,
+                None
+            )
         ]
 
     def __modifyAttributes( self, obj, attributes ):
@@ -105,14 +160,27 @@ class ListSetable( ListCapacity ):
         cls._addMethod( "set_" + self.safeAttributeName, self.__execute )
 
     def __execute( self, obj, *toBeSets ):
-        obj._github._statusRequest( "PUT", obj._baseUrl + "/" + self.attributeName, None, [ self.typePolicy.getIdentity( toBeSet ) for toBeSet in toBeSets ] )
+        obj._github._statusRequest(
+            "PUT",
+            obj._baseUrl + "/" + self.attributeName,
+            None,
+            [
+                self.typePolicy.getIdentity( toBeSet )
+                for toBeSet in toBeSets
+            ]
+        )
 
 class ListDeletable( ListCapacity ):
     def apply( self, cls ):
         cls._addMethod( "delete_" + self.safeAttributeName, self.__execute )
 
     def __execute( self, obj ):
-        obj._github._statusRequest( "DELETE", obj._baseUrl + "/" + self.attributeName, None, None )
+        obj._github._statusRequest(
+            "DELETE",
+            obj._baseUrl + "/" + self.attributeName,
+            None,
+            None
+        )
 
 def ExternalListOfObjects( attributeName, singularName, type, *capacities ):
     for capacity in capacities: