diff --git a/django/contrib/admin/options.py b/django/contrib/admin/options.py
index a9169936b4b..3ff918000bb 100644
--- a/django/contrib/admin/options.py
+++ b/django/contrib/admin/options.py
@@ -258,7 +258,7 @@ class BaseModelAdmin(six.with_metaclass(RenameBaseModelAdminMethods)):
             })
             kwargs['empty_label'] = _('None') if db_field.blank else None
 
-        if not 'queryset' in kwargs:
+        if 'queryset' not in kwargs:
             queryset = self.get_field_queryset(db, db_field, request)
             if queryset is not None:
                 kwargs['queryset'] = queryset
@@ -282,7 +282,7 @@ class BaseModelAdmin(six.with_metaclass(RenameBaseModelAdminMethods)):
         elif db_field.name in (list(self.filter_vertical) + list(self.filter_horizontal)):
             kwargs['widget'] = widgets.FilteredSelectMultiple(db_field.verbose_name, (db_field.name in self.filter_vertical))
 
-        if not 'queryset' in kwargs:
+        if 'queryset' not in kwargs:
             queryset = self.get_field_queryset(db, db_field, request)
             if queryset is not None:
                 kwargs['queryset'] = queryset
diff --git a/django/contrib/admin/validation.py b/django/contrib/admin/validation.py
index 784bee6f8bc..c71f710ca73 100644
--- a/django/contrib/admin/validation.py
+++ b/django/contrib/admin/validation.py
@@ -138,7 +138,7 @@ class BaseValidator(object):
                     raise ImproperlyConfigured("'%s.radio_fields['%s']' "
                             "is neither an instance of ForeignKey nor does "
                             "have choices set." % (cls.__name__, field))
-                if not val in (HORIZONTAL, VERTICAL):
+                if val not in (HORIZONTAL, VERTICAL):
                     raise ImproperlyConfigured("'%s.radio_fields['%s']' "
                             "is neither admin.HORIZONTAL nor admin.VERTICAL."
                             % (cls.__name__, field))
diff --git a/django/contrib/flatpages/templatetags/flatpages.py b/django/contrib/flatpages/templatetags/flatpages.py
index 4b036e92bbe..d7ced97d179 100644
--- a/django/contrib/flatpages/templatetags/flatpages.py
+++ b/django/contrib/flatpages/templatetags/flatpages.py
@@ -75,7 +75,7 @@ def get_flatpages(parser, token):
     syntax_message = ("%(tag_name)s expects a syntax of %(tag_name)s "
                       "['url_starts_with'] [for user] as context_name" %
                       dict(tag_name=bits[0]))
-   # Must have at 3-6 bits in the tag
+    # Must have at 3-6 bits in the tag
     if len(bits) >= 3 and len(bits) <= 6:
 
         # If there's an even number of bits, there's no prefix
diff --git a/django/contrib/gis/db/backends/postgis/operations.py b/django/contrib/gis/db/backends/postgis/operations.py
index 9cc5b3f683e..d85cc06bd70 100644
--- a/django/contrib/gis/db/backends/postgis/operations.py
+++ b/django/contrib/gis/db/backends/postgis/operations.py
@@ -481,14 +481,14 @@ class PostGISOperations(DatabaseOperations, BaseSpatialOperations):
         geo_col, db_type = lvalue
 
         if lookup_type in self.geometry_operators:
-            if field.geography and not lookup_type in self.geography_operators:
+            if field.geography and lookup_type not in self.geography_operators:
                 raise ValueError('PostGIS geography does not support the '
                                  '"%s" lookup.' % lookup_type)
             # Handling a PostGIS operator.
             op = self.geometry_operators[lookup_type]
             return op.as_sql(geo_col, self.get_geom_placeholder(field, value))
         elif lookup_type in self.geometry_functions:
-            if field.geography and not lookup_type in self.geography_functions:
+            if field.geography and lookup_type not in self.geography_functions:
                 raise ValueError('PostGIS geography type does not support the '
                                  '"%s" lookup.' % lookup_type)
 
diff --git a/django/contrib/gis/db/models/fields.py b/django/contrib/gis/db/models/fields.py
index 9986fc5036f..b71bba7725d 100644
--- a/django/contrib/gis/db/models/fields.py
+++ b/django/contrib/gis/db/models/fields.py
@@ -29,11 +29,11 @@ def get_srid_info(srid, connection):
         # No `spatial_ref_sys` table in spatial backend (e.g., MySQL).
         return None, None, None
 
-    if not connection.alias in _srid_cache:
+    if connection.alias not in _srid_cache:
         # Initialize SRID dictionary for database if it doesn't exist.
         _srid_cache[connection.alias] = {}
 
-    if not srid in _srid_cache[connection.alias]:
+    if srid not in _srid_cache[connection.alias]:
         # Use `SpatialRefSys` model to query for spatial reference info.
         sr = SpatialRefSys.objects.using(connection.alias).get(srid=srid)
         units, units_name = sr.units
@@ -225,7 +225,7 @@ class GeometryField(Field):
                     'srid': self.srid,
                     }
         defaults.update(kwargs)
-        if (self.dim > 2 and not 'widget' in kwargs and
+        if (self.dim > 2 and 'widget' not in kwargs and
                 not getattr(defaults['form_class'].widget, 'supports_3d', False)):
             defaults['widget'] = forms.Textarea
         return super(GeometryField, self).formfield(**defaults)
diff --git a/django/contrib/gis/db/models/query.py b/django/contrib/gis/db/models/query.py
index 3d0c2beec7a..37935605fad 100644
--- a/django/contrib/gis/db/models/query.py
+++ b/django/contrib/gis/db/models/query.py
@@ -467,7 +467,7 @@ class GeoQuerySet(QuerySet):
 
         # If the `geo_field_type` keyword was used, then enforce that
         # type limitation.
-        if not geo_field_type is None and not isinstance(geo_field, geo_field_type):
+        if geo_field_type is not None and not isinstance(geo_field, geo_field_type):
             raise TypeError('"%s" stored procedures may only be called on %ss.' % (func, geo_field_type.__name__))
 
         # Setting the procedure args.
@@ -488,7 +488,7 @@ class GeoQuerySet(QuerySet):
 
         # Checking if there are any geo field type limitations on this
         # aggregate (e.g. ST_Makeline only operates on PointFields).
-        if not geo_field_type is None and not isinstance(geo_field, geo_field_type):
+        if geo_field_type is not None and not isinstance(geo_field, geo_field_type):
             raise TypeError('%s aggregate may only be called on %ss.' % (aggregate.name, geo_field_type.__name__))
 
         # Getting the string expression of the field name, as this is the
@@ -766,7 +766,7 @@ class GeoQuerySet(QuerySet):
         ForeignKey relation to the current model.
         """
         opts = self.model._meta
-        if not geo_field in opts.fields:
+        if geo_field not in opts.fields:
             # Is this operation going to be on a related geographic field?
             # If so, it'll have to be added to the select related information
             # (e.g., if 'location__point' was given as the field name).
@@ -777,7 +777,7 @@ class GeoQuerySet(QuerySet):
                 if field == geo_field:
                     return compiler._field_column(geo_field, rel_table)
             raise ValueError("%r not in self.query.related_select_cols" % geo_field)
-        elif not geo_field in opts.local_fields:
+        elif geo_field not in opts.local_fields:
             # This geographic field is inherited from another model, so we have to
             # use the db table for the _parent_ model instead.
             tmp_fld, parent_model, direct, m2m = opts.get_field_by_name(geo_field.name)
diff --git a/django/contrib/gis/feeds.py b/django/contrib/gis/feeds.py
index f77a2eae0f3..006b0298f4f 100644
--- a/django/contrib/gis/feeds.py
+++ b/django/contrib/gis/feeds.py
@@ -37,7 +37,7 @@ class GeoFeedMixin(object):
         """
         # Getting the Geometry object.
         geom = item.get('geometry', None)
-        if not geom is None:
+        if geom is not None:
             if isinstance(geom, (list, tuple)):
                 # Special case if a tuple/list was passed in.  The tuple may be
                 # a point or a box
@@ -58,7 +58,7 @@ class GeoFeedMixin(object):
                     else:
                         raise ValueError('Only should be 2 or 4 numeric elements.')
                 # If a GeoRSS box was given via tuple.
-                if not box_coords is None:
+                if box_coords is not None:
                     if w3c_geo:
                         raise ValueError('Cannot use simple GeoRSS box in W3C Geo feeds.')
                     handler.addQuickElement('georss:box', self.georss_coords(box_coords))
diff --git a/django/contrib/gis/gdal/geometries.py b/django/contrib/gis/gdal/geometries.py
index 753baff9ac1..7c9ac2ce10b 100644
--- a/django/contrib/gis/gdal/geometries.py
+++ b/django/contrib/gis/gdal/geometries.py
@@ -205,7 +205,7 @@ class OGRGeometry(GDALBase):
 
     def _set_coord_dim(self, dim):
         "Sets the coordinate dimension of this Geometry."
-        if not dim in (2, 3):
+        if dim not in (2, 3):
             raise ValueError('Geometry dimension must be either 2 or 3')
         capi.set_coord_dim(self.ptr, dim)
 
diff --git a/django/contrib/gis/gdal/geomtype.py b/django/contrib/gis/gdal/geomtype.py
index 026e427b43c..1b5e079ef89 100644
--- a/django/contrib/gis/gdal/geomtype.py
+++ b/django/contrib/gis/gdal/geomtype.py
@@ -42,7 +42,7 @@ class OGRGeomType(object):
             if num is None:
                 raise OGRException('Invalid OGR String Type "%s"' % type_input)
         elif isinstance(type_input, int):
-            if not type_input in self._types:
+            if type_input not in self._types:
                 raise OGRException('Invalid OGR Integer Type: %d' % type_input)
             num = type_input
         else:
diff --git a/django/contrib/gis/gdal/layer.py b/django/contrib/gis/gdal/layer.py
index 1fe5f52fb5d..33fb3cb969d 100644
--- a/django/contrib/gis/gdal/layer.py
+++ b/django/contrib/gis/gdal/layer.py
@@ -195,7 +195,7 @@ class Layer(GDALBase):
         Returns a list containing the given field name for every Feature
         in the Layer.
         """
-        if not field_name in self.fields:
+        if field_name not in self.fields:
             raise OGRException('invalid field name: %s' % field_name)
         return [feat.get(field_name) for feat in self]
 
diff --git a/django/contrib/gis/gdal/libgdal.py b/django/contrib/gis/gdal/libgdal.py
index bdd79bf4027..40f302f1be8 100644
--- a/django/contrib/gis/gdal/libgdal.py
+++ b/django/contrib/gis/gdal/libgdal.py
@@ -36,7 +36,7 @@ else:
 if lib_names:
     for lib_name in lib_names:
         lib_path = find_library(lib_name)
-        if not lib_path is None:
+        if lib_path is not None:
             break
 
 if lib_path is None:
diff --git a/django/contrib/gis/geos/libgeos.py b/django/contrib/gis/geos/libgeos.py
index b6c5c6f5878..e503bbd3e6e 100644
--- a/django/contrib/gis/geos/libgeos.py
+++ b/django/contrib/gis/geos/libgeos.py
@@ -43,7 +43,7 @@ else:
 if lib_names:
     for lib_name in lib_names:
         lib_path = find_library(lib_name)
-        if not lib_path is None:
+        if lib_path is not None:
             break
 
 # No GEOS library could be found.
diff --git a/django/contrib/gis/geos/prototypes/io.py b/django/contrib/gis/geos/prototypes/io.py
index 7f95146207d..a09e9774254 100644
--- a/django/contrib/gis/geos/prototypes/io.py
+++ b/django/contrib/gis/geos/prototypes/io.py
@@ -189,7 +189,7 @@ class WKTWriter(IOBase):
 
     @outdim.setter
     def outdim(self, new_dim):
-        if not new_dim in (2, 3):
+        if new_dim not in (2, 3):
             raise ValueError('WKT output dimension must be 2 or 3')
         wkt_writer_set_outdim(self.ptr, new_dim)
 
@@ -214,7 +214,7 @@ class WKBWriter(IOBase):
         return wkb_writer_get_byteorder(self.ptr)
 
     def _set_byteorder(self, order):
-        if not order in (0, 1):
+        if order not in (0, 1):
             raise ValueError('Byte order parameter must be 0 (Big Endian) or 1 (Little Endian).')
         wkb_writer_set_byteorder(self.ptr, order)
 
@@ -225,7 +225,7 @@ class WKBWriter(IOBase):
         return wkb_writer_get_outdim(self.ptr)
 
     def _set_outdim(self, new_dim):
-        if not new_dim in (2, 3):
+        if new_dim not in (2, 3):
             raise ValueError('WKB output dimension must be 2 or 3')
         wkb_writer_set_outdim(self.ptr, new_dim)
 
diff --git a/django/contrib/gis/geos/tests/test_geos.py b/django/contrib/gis/geos/tests/test_geos.py
index 3d9c9c63349..fa7775b552d 100644
--- a/django/contrib/gis/geos/tests/test_geos.py
+++ b/django/contrib/gis/geos/tests/test_geos.py
@@ -503,7 +503,8 @@ class GEOSTest(unittest.TestCase, TestDataMixin):
         del poly
 
         # Access to these rings is OK since they are clones.
-        s1, s2 = str(ring1), str(ring2)
+        str(ring1)
+        str(ring2)
 
     def test_coord_seq(self):
         "Testing Coordinate Sequence objects."
diff --git a/django/contrib/gis/utils/layermapping.py b/django/contrib/gis/utils/layermapping.py
index b2c9417d31e..eda80697a4d 100644
--- a/django/contrib/gis/utils/layermapping.py
+++ b/django/contrib/gis/utils/layermapping.py
@@ -239,7 +239,7 @@ class LayerMapping(object):
                     raise TypeError('ForeignKey mapping must be of dictionary type.')
             else:
                 # Is the model field type supported by LayerMapping?
-                if not model_field.__class__ in self.FIELD_TYPES:
+                if model_field.__class__ not in self.FIELD_TYPES:
                     raise LayerMapError('Django field type "%s" has no OGR mapping (yet).' % fld_name)
 
                 # Is the OGR field in the Layer?
@@ -277,7 +277,7 @@ class LayerMapping(object):
         if isinstance(unique, (list, tuple)):
             # List of fields to determine uniqueness with
             for attr in unique:
-                if not attr in self.mapping:
+                if attr not in self.mapping:
                     raise ValueError
         elif isinstance(unique, six.string_types):
             # Only a single field passed in.
diff --git a/django/contrib/staticfiles/management/commands/collectstatic.py b/django/contrib/staticfiles/management/commands/collectstatic.py
index bc247c81771..c9fef98371a 100644
--- a/django/contrib/staticfiles/management/commands/collectstatic.py
+++ b/django/contrib/staticfiles/management/commands/collectstatic.py
@@ -312,5 +312,5 @@ class Command(NoArgsCommand):
             self.log("Copying '%s'" % source_path, level=1)
             with source_storage.open(path) as source_file:
                 self.storage.save(prefixed_path, source_file)
-        if not prefixed_path in self.copied_files:
+        if prefixed_path not in self.copied_files:
             self.copied_files.append(prefixed_path)
diff --git a/django/core/management/commands/inspectdb.py b/django/core/management/commands/inspectdb.py
index f4c8003a41e..52e75c21de2 100644
--- a/django/core/management/commands/inspectdb.py
+++ b/django/core/management/commands/inspectdb.py
@@ -118,7 +118,7 @@ class Command(NoArgsCommand):
                             field_type = 'NullBooleanField('
                         else:
                             extra_params['blank'] = True
-                            if not field_type in ('TextField(', 'CharField('):
+                            if field_type not in ('TextField(', 'CharField('):
                                 extra_params['null'] = True
 
                     field_desc = '%s = %s%s' % (
diff --git a/django/core/signing.py b/django/core/signing.py
index 4a74b91ee20..d1f204bfc15 100644
--- a/django/core/signing.py
+++ b/django/core/signing.py
@@ -165,7 +165,7 @@ class Signer(object):
 
     def unsign(self, signed_value):
         signed_value = force_str(signed_value)
-        if not self.sep in signed_value:
+        if self.sep not in signed_value:
             raise BadSignature('No "%s" found in value' % self.sep)
         value, sig = signed_value.rsplit(self.sep, 1)
         if constant_time_compare(sig, self.signature(value)):
diff --git a/django/core/validators.py b/django/core/validators.py
index 4b7627cc7c0..cc71b72a6ac 100644
--- a/django/core/validators.py
+++ b/django/core/validators.py
@@ -141,7 +141,7 @@ class EmailValidator(object):
         if not self.user_regex.match(user_part):
             raise ValidationError(self.message, code=self.code)
 
-        if (not domain_part in self.domain_whitelist and
+        if (domain_part not in self.domain_whitelist and
                 not self.validate_domain_part(domain_part)):
             # Try for possible IDN domain-part
             try:
diff --git a/django/db/backends/utils.py b/django/db/backends/utils.py
index 8bed6415c3f..9c4d15d8ce9 100644
--- a/django/db/backends/utils.py
+++ b/django/db/backends/utils.py
@@ -131,7 +131,7 @@ def typecast_timestamp(s):  # does NOT store time zone information
     # "2005-07-29 09:56:00-05"
     if not s:
         return None
-    if not ' ' in s:
+    if ' ' not in s:
         return typecast_date(s)
     d, t = s.split()
     # Extract timezone information, if it exists. Currently we just throw
diff --git a/django/db/models/lookups.py b/django/db/models/lookups.py
index 797f767a972..7714668b9b6 100644
--- a/django/db/models/lookups.py
+++ b/django/db/models/lookups.py
@@ -15,7 +15,7 @@ class RegisterLookupMixin(object):
         except KeyError:
             # To allow for inheritance, check parent class' class_lookups.
             for parent in inspect.getmro(self.__class__):
-                if not 'class_lookups' in parent.__dict__:
+                if 'class_lookups' not in parent.__dict__:
                     continue
                 if lookup_name in parent.class_lookups:
                     return parent.class_lookups[lookup_name]
@@ -40,7 +40,7 @@ class RegisterLookupMixin(object):
 
     @classmethod
     def register_lookup(cls, lookup):
-        if not 'class_lookups' in cls.__dict__:
+        if 'class_lookups' not in cls.__dict__:
             cls.class_lookups = {}
         cls.class_lookups[lookup.lookup_name] = lookup
 
diff --git a/django/db/models/manager.py b/django/db/models/manager.py
index 4f28253de93..b6079004f3a 100644
--- a/django/db/models/manager.py
+++ b/django/db/models/manager.py
@@ -128,7 +128,7 @@ class BaseManager(six.with_metaclass(RenameManagerMethods)):
         elif model._meta.swapped:
             setattr(model, name, SwappedManagerDescriptor(model))
         else:
-        # if not model._meta.abstract and not model._meta.swapped:
+            # if not model._meta.abstract and not model._meta.swapped:
             setattr(model, name, ManagerDescriptor(self))
         if not getattr(model, '_default_manager', None) or self.creation_counter < model._default_manager.creation_counter:
             model._default_manager = self
diff --git a/django/forms/formsets.py b/django/forms/formsets.py
index d5600867e10..9c4c7b5b9ae 100644
--- a/django/forms/formsets.py
+++ b/django/forms/formsets.py
@@ -153,7 +153,7 @@ class BaseFormSet(object):
         if self.is_bound:
             defaults['data'] = self.data
             defaults['files'] = self.files
-        if self.initial and not 'initial' in kwargs:
+        if self.initial and 'initial' not in kwargs:
             try:
                 defaults['initial'] = self.initial[i]
             except IndexError:
diff --git a/django/forms/models.py b/django/forms/models.py
index 6a3dc62342a..5b799fe6945 100644
--- a/django/forms/models.py
+++ b/django/forms/models.py
@@ -46,7 +46,7 @@ def construct_instance(form, instance, fields=None, exclude=None):
     file_field_list = []
     for f in opts.fields:
         if not f.editable or isinstance(f, models.AutoField) \
-                or not f.name in cleaned_data:
+                or f.name not in cleaned_data:
             continue
         if fields is not None and f.name not in fields:
             continue
@@ -130,7 +130,7 @@ def model_to_dict(instance, fields=None, exclude=None):
     for f in opts.concrete_fields + opts.virtual_fields + opts.many_to_many:
         if not getattr(f, 'editable', False):
             continue
-        if fields and not f.name in fields:
+        if fields and f.name not in fields:
             continue
         if exclude and f.name in exclude:
             continue
@@ -189,7 +189,7 @@ def fields_for_model(model, fields=None, exclude=None, widgets=None,
     for f in sorted(opts.concrete_fields + sortable_virtual_fields + opts.many_to_many):
         if not getattr(f, 'editable', False):
             continue
-        if fields is not None and not f.name in fields:
+        if fields is not None and f.name not in fields:
             continue
         if exclude and f.name in exclude:
             continue
@@ -663,7 +663,7 @@ class BaseModelFormSet(BaseFormSet):
                 # Reduce Model instances to their primary key values
                 row_data = tuple(d._get_pk_val() if hasattr(d, '_get_pk_val') else d
                                  for d in row_data)
-                if row_data and not None in row_data:
+                if row_data and None not in row_data:
                     # if we've already seen it then we have a uniqueness failure
                     if row_data in seen_data:
                         # poke error messages into the right places and mark
diff --git a/django/middleware/cache.py b/django/middleware/cache.py
index a58b21f58aa..1c400fe605d 100644
--- a/django/middleware/cache.py
+++ b/django/middleware/cache.py
@@ -132,7 +132,7 @@ class FetchFromCacheMiddleware(object):
         Checks whether the page is already cached and returns the cached
         version if available.
         """
-        if not request.method in ('GET', 'HEAD'):
+        if request.method not in ('GET', 'HEAD'):
             request._cache_update_cache = False
             return None  # Don't bother checking the cache.
 
diff --git a/django/template/defaultfilters.py b/django/template/defaultfilters.py
index 64f8e28190d..9ae5c1f7358 100644
--- a/django/template/defaultfilters.py
+++ b/django/template/defaultfilters.py
@@ -932,7 +932,7 @@ def pluralize(value, arg='s'):
     * If value is 1, cand{{ value|pluralize:"y,ies" }} displays "1 candy".
     * If value is 2, cand{{ value|pluralize:"y,ies" }} displays "2 candies".
     """
-    if not ',' in arg:
+    if ',' not in arg:
         arg = ',' + arg
     bits = arg.split(',')
     if len(bits) > 2:
diff --git a/django/template/defaulttags.py b/django/template/defaulttags.py
index c61851bbd1e..74998cb4036 100644
--- a/django/template/defaulttags.py
+++ b/django/template/defaulttags.py
@@ -619,7 +619,7 @@ def cycle(parser, token, escape=False):
         name = args[1]
         if not hasattr(parser, '_namedCycleNodes'):
             raise TemplateSyntaxError("No named cycles in template. '%s' is not defined" % name)
-        if not name in parser._namedCycleNodes:
+        if name not in parser._namedCycleNodes:
             raise TemplateSyntaxError("Named cycle '%s' does not exist" % name)
         return parser._namedCycleNodes[name]
 
diff --git a/django/utils/html.py b/django/utils/html.py
index 79488fc473f..569810c6cc9 100644
--- a/django/utils/html.py
+++ b/django/utils/html.py
@@ -276,7 +276,7 @@ def urlize(text, trim_url_limit=None, nofollow=False, autoescape=False):
                 url = smart_urlquote(middle)
             elif simple_url_2_re.match(middle):
                 url = smart_urlquote('http://%s' % middle)
-            elif not ':' in middle and simple_email_re.match(middle):
+            elif ':' not in middle and simple_email_re.match(middle):
                 local, domain = middle.rsplit('@', 1)
                 try:
                     domain = domain.encode('idna').decode('ascii')
diff --git a/django/utils/log.py b/django/utils/log.py
index 83ba15f52a4..558ffb87460 100644
--- a/django/utils/log.py
+++ b/django/utils/log.py
@@ -74,7 +74,7 @@ def configure_logging(logging_config, logging_settings):
         warnings.simplefilter("default", RemovedInNextVersionWarning)
 
     if logging_config:
-         # First find the logging configuration function ...
+        # First find the logging configuration function ...
         logging_config_func = import_string(logging_config)
 
         logging_config_func(DEFAULT_LOGGING)
diff --git a/scripts/manage_translations.py b/scripts/manage_translations.py
index 078cc7f9bb1..4b7f856b2de 100644
--- a/scripts/manage_translations.py
+++ b/scripts/manage_translations.py
@@ -115,7 +115,7 @@ def lang_stats(resources=None, languages=None):
         print("\nShowing translations stats for '%s':" % name)
         langs = sorted([d for d in os.listdir(dir_) if not d.startswith('_')])
         for lang in langs:
-            if languages and not lang in languages:
+            if languages and lang not in languages:
                 continue
             # TODO: merge first with the latest en catalog
             p = Popen("msgfmt -vc -o /dev/null %(path)s/%(lang)s/LC_MESSAGES/django%(ext)s.po" % {
diff --git a/tests/admin_views/tests.py b/tests/admin_views/tests.py
index 6e0c08c1ecb..67568282da0 100644
--- a/tests/admin_views/tests.py
+++ b/tests/admin_views/tests.py
@@ -1414,7 +1414,7 @@ class AdminViewPermissionsTest(TestCase):
         self.client.get('/test_admin/admin/')
         self.client.post(login_url, self.deleteuser_login)
         response = self.client.get('/test_admin/admin/admin_views/section/1/delete/')
-         # test response contains link to related Article
+        # test response contains link to related Article
         self.assertContains(response, "admin_views/article/1/")
 
         response = self.client.get('/test_admin/admin/admin_views/article/1/delete/')
diff --git a/tests/forms_tests/tests/test_fields.py b/tests/forms_tests/tests/test_fields.py
index 454a8349d70..e57a4b5fd95 100644
--- a/tests/forms_tests/tests/test_fields.py
+++ b/tests/forms_tests/tests/test_fields.py
@@ -1161,7 +1161,7 @@ class FieldsTests(SimpleTestCase):
             "'Select a valid choice. 3 is not one of the available choices.'",
             f.clean, ['3'])
 
-   # ComboField ##################################################################
+    # ComboField ##################################################################
 
     def test_combofield_1(self):
         f = ComboField(fields=[CharField(max_length=20), EmailField()])
diff --git a/tests/lookup/tests.py b/tests/lookup/tests.py
index 8a9b69b879c..04d9f0fc9ea 100644
--- a/tests/lookup/tests.py
+++ b/tests/lookup/tests.py
@@ -436,7 +436,7 @@ class LookupTests(TestCase):
             ])
 
     def test_none(self):
-       # none() returns a QuerySet that behaves like any other QuerySet object
+        # none() returns a QuerySet that behaves like any other QuerySet object
         self.assertQuerysetEqual(Article.objects.none(), [])
         self.assertQuerysetEqual(
             Article.objects.none().filter(headline__startswith='Article'), [])
diff --git a/tests/mail/tests.py b/tests/mail/tests.py
index 5912d94efb2..06292b3cb65 100644
--- a/tests/mail/tests.py
+++ b/tests/mail/tests.py
@@ -192,7 +192,7 @@ class MailTests(HeadersCheckMixin, SimpleTestCase):
         SafeMIMEMultipart as well
         """
         headers = {"Date": "Fri, 09 Nov 2001 01:08:47 -0000", "Message-ID": "foo"}
-        subject, from_email, to = 'hello', 'from@example.com', '"Sürname, Firstname" <to@example.com>'
+        from_email, to = 'from@example.com', '"Sürname, Firstname" <to@example.com>'
         text_content = 'This is an important message.'
         html_content = '<p>This is an <strong>important</strong> message.</p>'
         msg = EmailMultiAlternatives('Message from Firstname Sürname', text_content, from_email, [to], headers=headers)
diff --git a/tests/save_delete_hooks/models.py b/tests/save_delete_hooks/models.py
index a6e1abfb77f..abba693778b 100644
--- a/tests/save_delete_hooks/models.py
+++ b/tests/save_delete_hooks/models.py
@@ -24,7 +24,7 @@ class Person(models.Model):
 
     def save(self, *args, **kwargs):
         self.data.append("Before save")
-         # Call the "real" save() method
+        # Call the "real" save() method
         super(Person, self).save(*args, **kwargs)
         self.data.append("After save")
 
diff --git a/tests/str/tests.py b/tests/str/tests.py
index aeb28741950..4139fa43544 100644
--- a/tests/str/tests.py
+++ b/tests/str/tests.py
@@ -1,4 +1,4 @@
- # -*- coding: utf-8 -*-
+# -*- coding: utf-8 -*-
 from __future__ import unicode_literals
 
 import datetime
diff --git a/tests/template_tests/test_response.py b/tests/template_tests/test_response.py
index 17d8f11ba5f..48a7b890293 100644
--- a/tests/template_tests/test_response.py
+++ b/tests/template_tests/test_response.py
@@ -259,7 +259,8 @@ class TemplateResponseTest(TestCase):
             'first/test.html', {
                 'value': 123,
                 'fn': datetime.now,
-            })
+            }
+        )
         self.assertRaises(ContentNotRenderedError,
                           pickle.dumps, response)