Fixed #21302 -- Fixed unused imports and import *.

django/contrib/admin/__init__.py

@@ -10,6 +10,14 @@ from django.contrib.admin.filters import (ListFilter, SimpleListFilter,
     ChoicesFieldListFilter, DateFieldListFilter, AllValuesFieldListFilter)
 from django.utils.module_loading import autodiscover_modules
 
+__all__ = [
+    "register", "ACTION_CHECKBOX_NAME", "ModelAdmin", "HORIZONTAL", "VERTICAL",
+    "StackedInline", "TabularInline", "AdminSite", "site", "ListFilter",
+    "SimpleListFilter", "FieldListFilter", "BooleanFieldListFilter",
+    "RelatedFieldListFilter", "ChoicesFieldListFilter", "DateFieldListFilter",
+    "AllValuesFieldListFilter", "autodiscover",
+]
+
 
 def autodiscover():
     autodiscover_modules('admin', register_to=site)

django/contrib/auth/models.py

@@ -1,5 +1,4 @@
 from __future__ import unicode_literals
-import re
 
 from django.core.mail import send_mail
 from django.core import validators

django/contrib/auth/tests/test_decorators.py

@@ -1,8 +1,6 @@
 from django.conf import settings
 from django.contrib.auth import models
 from django.contrib.auth.decorators import login_required, permission_required
-# Trigger CustomUser perm creation:
-from django.contrib.auth.tests.custom_user import CustomUser
 from django.contrib.auth.tests.test_views import AuthViewsTestCase
 from django.contrib.auth.tests.utils import skipIfCustomUser
 from django.core.exceptions import PermissionDenied

django/contrib/auth/tests/test_models.py

@@ -1,6 +1,5 @@
 from django.contrib.auth import get_user_model
 from django.contrib.auth.models import AbstractUser, Group, User, UserManager
-from django.contrib.auth.tests.custom_user import IsActiveTestUser1
 from django.contrib.auth.tests.utils import skipIfCustomUser
 from django.core import mail
 from django.db.models.signals import post_save

django/contrib/auth/tests/test_views.py

@@ -21,7 +21,6 @@ from django.contrib.sessions.middleware import SessionMiddleware
 from django.contrib.auth import SESSION_KEY, REDIRECT_FIELD_NAME
 from django.contrib.auth.forms import (AuthenticationForm, PasswordChangeForm,
                 SetPasswordForm)
-from django.contrib.auth.tests.custom_user import CustomUser
 from django.contrib.auth.tests.utils import skipIfCustomUser
 from django.contrib.auth.views import login as login_view
 

django/contrib/formtools/wizard/storage/__init__.py

@@ -5,6 +5,10 @@ from django.contrib.formtools.wizard.storage.base import BaseStorage
 from django.contrib.formtools.wizard.storage.exceptions import (
     MissingStorage, NoFileStorageConfigured)
 
+__all__ = [
+    "BaseStorage", "MissingStorage", "NoFileStorageConfigured", "get_storage",
+]
+
 
 def get_storage(path, *args, **kwargs):
     try:

django/contrib/gis/admin/__init__.py

@@ -1,12 +1,21 @@
 # Getting the normal admin routines, classes, and `site` instance.
-from django.contrib.admin import autodiscover, site, AdminSite, ModelAdmin, StackedInline, TabularInline, HORIZONTAL, VERTICAL
+from django.contrib.admin import (  # NOQA: flake8 detects only the last __all__
-
+    autodiscover, site, AdminSite, ModelAdmin, StackedInline, TabularInline,
+    HORIZONTAL, VERTICAL,
+)
 # Geographic admin options classes and widgets.
-from django.contrib.gis.admin.options import GeoModelAdmin
+from django.contrib.gis.admin.options import GeoModelAdmin      # NOQA
-from django.contrib.gis.admin.widgets import OpenLayersWidget
+from django.contrib.gis.admin.widgets import OpenLayersWidget   # NOQA
+
+__all__ = [
+    "autodiscover", "site", "AdminSite", "ModelAdmin", "StackedInline",
+    "TabularInline", "HORIZONTAL", "VERTICAL",
+    "GeoModelAdmin", "OpenLayersWidget", "HAS_OSM",
+]
 
 try:
     from django.contrib.gis.admin.options import OSMGeoAdmin
     HAS_OSM = True
+    __all__ += ['OSMGeoAdmin']
 except ImportError:
     HAS_OSM = False

django/contrib/gis/db/models/__init__.py

@@ -1,14 +1,14 @@
 # Want to get everything from the 'normal' models package.
-from django.db.models import *
+from django.db.models import *  # NOQA
 
 # Geographic aggregate functions
-from django.contrib.gis.db.models.aggregates import *
+from django.contrib.gis.db.models.aggregates import *  # NOQA
 
 # The GeoManager
-from django.contrib.gis.db.models.manager import GeoManager
+from django.contrib.gis.db.models.manager import GeoManager  # NOQA
 
 # The geographic-enabled fields.
-from django.contrib.gis.db.models.fields import (
+from django.contrib.gis.db.models.fields import (  # NOQA
     GeometryField, PointField, LineStringField, PolygonField,
     MultiPointField, MultiLineStringField, MultiPolygonField,
     GeometryCollectionField)

django/contrib/gis/db/models/aggregates.py

@@ -1,5 +1,7 @@
 from django.db.models import Aggregate
 
+__all__ = ['Collect', 'Extent', 'Extent3D', 'MakeLine', 'Union']
+
 
 class Collect(Aggregate):
     name = 'Collect'

django/contrib/gis/db/models/sql/__init__.py

@@ -1,3 +1,7 @@
 from django.contrib.gis.db.models.sql.conversion import AreaField, DistanceField, GeomField
 from django.contrib.gis.db.models.sql.query import GeoQuery
 from django.contrib.gis.db.models.sql.where import GeoWhereNode
+
+__all__ = [
+    'AreaField', 'DistanceField', 'GeomField', 'GeoQuery', 'GeoWhereNode',
+]

django/contrib/gis/db/models/sql/aggregates.py

@@ -1,4 +1,4 @@
-from django.db.models.sql.aggregates import *
+from django.db.models.sql.aggregates import Aggregate
 from django.contrib.gis.db.models.fields import GeometryField
 
 

django/contrib/gis/forms/__init__.py

@@ -1,5 +1,5 @@
-from django.forms import *
+from django.forms import *  # NOQA
-from .fields import (GeometryField, GeometryCollectionField, PointField,
+from .fields import (GeometryField, GeometryCollectionField, PointField,  # NOQA
     MultiPointField, LineStringField, MultiLineStringField, PolygonField,
     MultiPolygonField)
-from .widgets import BaseGeometryWidget, OpenLayersWidget, OSMWidget
+from .widgets import BaseGeometryWidget, OpenLayersWidget, OSMWidget  # NOQA

django/contrib/gis/forms/fields.py

@@ -5,7 +5,7 @@ from django.utils.translation import ugettext_lazy as _
 
 # While this couples the geographic forms to the GEOS library,
 # it decouples from database (by not importing SpatialBackend).
-from django.contrib.gis.geos import GEOSException, GEOSGeometry, fromstr
+from django.contrib.gis.geos import GEOSException, GEOSGeometry
 from .widgets import OpenLayersWidget
 
 

django/contrib/gis/gdal/__init__.py

@@ -31,24 +31,34 @@
  to a non-existant file location (e.g., `GDAL_LIBRARY_PATH='/null/path'`;
  setting to None/False/'' will not work as a string must be given).
 """
-from django.contrib.gis.gdal.error import check_err, OGRException, OGRIndexError, SRSException
+from django.contrib.gis.gdal.error import check_err, OGRException, OGRIndexError, SRSException  # NOQA
-from django.contrib.gis.gdal.geomtype import OGRGeomType
+from django.contrib.gis.gdal.geomtype import OGRGeomType  # NOQA
+
+__all__ = [
+    'check_err', 'OGRException', 'OGRIndexError', 'SRSException', 'OGRGeomType',
+    'HAS_GDAL',
+]
 
 # Attempting to import objects that depend on the GDAL library.  The
 # HAS_GDAL flag will be set to True if the library is present on
 # the system.
 try:
-    from django.contrib.gis.gdal.driver import Driver
+    from django.contrib.gis.gdal.driver import Driver  # NOQA
-    from django.contrib.gis.gdal.datasource import DataSource
+    from django.contrib.gis.gdal.datasource import DataSource  # NOQA
-    from django.contrib.gis.gdal.libgdal import gdal_version, gdal_full_version, GDAL_VERSION
+    from django.contrib.gis.gdal.libgdal import gdal_version, gdal_full_version, GDAL_VERSION  # NOQA
-    from django.contrib.gis.gdal.srs import SpatialReference, CoordTransform
+    from django.contrib.gis.gdal.srs import SpatialReference, CoordTransform  # NOQA
-    from django.contrib.gis.gdal.geometries import OGRGeometry
+    from django.contrib.gis.gdal.geometries import OGRGeometry  # NOQA
     HAS_GDAL = True
+    __all__ += [
+        'Driver', 'DataSource', 'gdal_version', 'gdal_full_version',
+        'GDAL_VERSION', 'SpatialReference', 'CoordTransform', 'OGRGeometry',
+    ]
 except OGRException:
     HAS_GDAL = False
 
 try:
     from django.contrib.gis.gdal.envelope import Envelope
+    __all__ += ['Envelope']
 except ImportError:
     # No ctypes, but don't raise an exception.
     pass

django/contrib/gis/geoip/__init__.py

@@ -11,8 +11,11 @@
  Grab GeoIP.dat.gz and GeoLiteCity.dat.gz, and unzip them in the directory
  corresponding to settings.GEOIP_PATH.
 """
+__all__ = ['HAS_GEOIP']
+
 try:
     from .base import GeoIP, GeoIPException
     HAS_GEOIP = True
+    __all__ += ['GeoIP', 'GeoIPException']
 except RuntimeError:  # libgeoip.py raises a RuntimeError if no GeoIP library is found
     HAS_GEOIP = False

django/contrib/gis/geoip/base.py

@@ -5,7 +5,7 @@ from ctypes import c_char_p
 from django.core.validators import ipv4_re
 from django.contrib.gis.geoip.libgeoip import GEOIP_SETTINGS
 from django.contrib.gis.geoip.prototypes import (
-    GeoIPRecord, GeoIPTag, GeoIP_open, GeoIP_delete, GeoIP_database_info,
+    GeoIP_open, GeoIP_delete, GeoIP_database_info,
     GeoIP_lib_version, GeoIP_record_by_addr, GeoIP_record_by_name,
     GeoIP_country_code_by_addr, GeoIP_country_code_by_name,
     GeoIP_country_name_by_addr, GeoIP_country_name_by_name)

django/contrib/gis/geometry/backend/geos.py

@@ -1,2 +1,4 @@
 from django.contrib.gis.geos import (
     GEOSGeometry as Geometry, GEOSException as GeometryException)
+
+__all__ = ['Geometry', 'GeometryException']

django/contrib/gis/geos/__init__.py

@@ -3,9 +3,12 @@ The GeoDjango GEOS module.  Please consult the GeoDjango documentation
 for more details:
   http://geodjango.org/docs/geos.html
 """
+__all__ = ['HAS_GEOS']
+
 try:
-    from .libgeos import geos_version, geos_version_info, GEOS_PREPARE
+    from .libgeos import geos_version, geos_version_info, GEOS_PREPARE  # NOQA: flake8 detects only the last __all__
     HAS_GEOS = True
+    __all__ += ['geos_version', 'geos_version_info', 'GEOS_PREPARE']
 except ImportError:
     HAS_GEOS = False
 
@@ -18,3 +21,11 @@ if HAS_GEOS:
     from .error import GEOSException, GEOSIndexError
     from .io import WKTReader, WKTWriter, WKBReader, WKBWriter
     from .factory import fromfile, fromstr
+
+    __all__ += [
+        'GEOSGeometry', 'wkt_regex', 'hex_regex', 'Point', 'LineString',
+        'LinearRing', 'Polygon', 'GeometryCollection', 'MultiPoint',
+        'MultiLineString', 'MultiPolygon', 'GEOSException', 'GEOSIndexError',
+        'WKTReader', 'WKTWriter', 'WKBReader', 'WKBWriter', 'fromfile',
+        'fromstr',
+    ]

django/contrib/gis/geos/io.py

@@ -6,6 +6,8 @@ reader and writer classes.
 from django.contrib.gis.geos.geometry import GEOSGeometry
 from django.contrib.gis.geos.prototypes.io import _WKTReader, _WKBReader, WKBWriter, WKTWriter
 
+__all__ = ['WKBWriter', 'WKTWriter', 'WKBReader', 'WKTReader']
+
 
 # Public classes for (WKB|WKT)Reader, which return GEOSGeometry
 class WKBReader(_WKBReader):

django/contrib/gis/geos/prototypes/__init__.py

@@ -5,12 +5,12 @@
 """
 
 # Coordinate sequence routines.
-from django.contrib.gis.geos.prototypes.coordseq import (create_cs, get_cs,
+from django.contrib.gis.geos.prototypes.coordseq import (create_cs, get_cs,  # NOQA
     cs_clone, cs_getordinate, cs_setordinate, cs_getx, cs_gety, cs_getz,
     cs_setx, cs_sety, cs_setz, cs_getsize, cs_getdims)
 
 # Geometry routines.
-from django.contrib.gis.geos.prototypes.geom import (from_hex, from_wkb, from_wkt,
+from django.contrib.gis.geos.prototypes.geom import (from_hex, from_wkb, from_wkt,  # NOQA
     create_point, create_linestring, create_linearring, create_polygon, create_collection,
     destroy_geom, get_extring, get_intring, get_nrings, get_geomn, geom_clone,
     geos_normalize, geos_type, geos_typeid, geos_get_srid, geos_set_srid,
@@ -18,13 +18,13 @@ from django.contrib.gis.geos.prototypes.geom import (from_hex, from_wkb, from_wk
     to_hex, to_wkb, to_wkt)
 
 # Miscellaneous routines.
-from django.contrib.gis.geos.prototypes.misc import *
+from django.contrib.gis.geos.prototypes.misc import *  # NOQA
 
 # Predicates
-from django.contrib.gis.geos.prototypes.predicates import (geos_hasz, geos_isempty,
+from django.contrib.gis.geos.prototypes.predicates import (geos_hasz, geos_isempty,  # NOQA
     geos_isring, geos_issimple, geos_isvalid, geos_contains, geos_crosses,
     geos_disjoint, geos_equals, geos_equalsexact, geos_intersects,
     geos_overlaps, geos_relatepattern, geos_touches, geos_within)
 
 # Topology routines
-from django.contrib.gis.geos.prototypes.topology import *
+from django.contrib.gis.geos.prototypes.topology import *  # NOQA

django/contrib/gis/maps/google/__init__.py

@@ -59,3 +59,8 @@
 from django.contrib.gis.maps.google.gmap import GoogleMap, GoogleMapSet
 from django.contrib.gis.maps.google.overlays import GEvent, GIcon, GMarker, GPolygon, GPolyline
 from django.contrib.gis.maps.google.zoom import GoogleZoom
+
+__all__ = [
+    'GoogleMap', 'GoogleMapSet', 'GEvent', 'GIcon', 'GMarker', 'GPolygon',
+    'GPolyline', 'GoogleZoom',
+]

django/contrib/gis/sitemaps/__init__.py

@@ -1,3 +1,5 @@
 # Geo-enabled Sitemap classes.
 from django.contrib.gis.sitemaps.georss import GeoRSSSitemap
 from django.contrib.gis.sitemaps.kml import KMLSitemap, KMZSitemap
+
+__all__ = ['GeoRSSSitemap', 'KMLSitemap', 'KMZSitemap']

django/contrib/gis/utils/__init__.py

@@ -4,15 +4,15 @@
 # Importing the utilities that depend on GDAL, if available.
 from django.contrib.gis.gdal import HAS_GDAL
 if HAS_GDAL:
-    from django.contrib.gis.utils.ogrinfo import ogrinfo, sample
+    from django.contrib.gis.utils.ogrinfo import ogrinfo, sample  # NOQA
-    from django.contrib.gis.utils.ogrinspect import mapping, ogrinspect
+    from django.contrib.gis.utils.ogrinspect import mapping, ogrinspect  # NOQA
-    from django.contrib.gis.utils.srs import add_postgis_srs, add_srs_entry
+    from django.contrib.gis.utils.srs import add_postgis_srs, add_srs_entry  # NOQA
     from django.core.exceptions import ImproperlyConfigured
     try:
         # LayerMapping requires DJANGO_SETTINGS_MODULE to be set,
         # so this needs to be in try/except.
-        from django.contrib.gis.utils.layermapping import LayerMapping, LayerMapError
+        from django.contrib.gis.utils.layermapping import LayerMapping, LayerMapError  # NOQA
     except ImproperlyConfigured:
         pass
 
-from django.contrib.gis.utils.wkt import precision_wkt
+from django.contrib.gis.utils.wkt import precision_wkt  # NOQA

django/contrib/messages/__init__.py

@@ -1,2 +1,2 @@
-from django.contrib.messages.api import *
+from django.contrib.messages.api import *  # NOQA
-from django.contrib.messages.constants import *
+from django.contrib.messages.constants import *  # NOQA

django/core/cache/__init__.py

@@ -14,19 +14,17 @@ class.
 
 See docs/topics/cache.txt for information on the public API.
 """
-import importlib
-
 from django.conf import settings
 from django.core import signals
 from django.core.cache.backends.base import (
     InvalidCacheBackendError, CacheKeyWarning, BaseCache)
 from django.core.exceptions import ImproperlyConfigured
 from django.utils.module_loading import import_by_path
-from django.utils.six.moves.urllib.parse import parse_qsl
 
 
 __all__ = [
-    'get_cache', 'cache', 'DEFAULT_CACHE_ALIAS'
+    'get_cache', 'cache', 'DEFAULT_CACHE_ALIAS', 'InvalidCacheBackendError',
+    'CacheKeyWarning', 'BaseCache',
 ]
 
 DEFAULT_CACHE_ALIAS = 'default'

django/core/cache/backends/db.py

@@ -1,6 +1,5 @@
 "Database cache backend."
 import base64
-import time
 from datetime import datetime
 
 try:

django/core/files/__init__.py

@@ -1 +1,3 @@
 from django.core.files.base import File
+
+__all__ = ['File']

django/core/handlers/wsgi.py

@@ -17,7 +17,7 @@ from django.utils.encoding import force_str, force_text
 from django.utils import six
 
 # For backwards compatibility -- lots of code uses this in the wild!
-from django.http.response import REASON_PHRASES as STATUS_CODE_TEXT
+from django.http.response import REASON_PHRASES as STATUS_CODE_TEXT  # NOQA
 
 logger = logging.getLogger('django.request')
 

django/core/mail/__init__.py

@@ -17,6 +17,14 @@ from django.core.mail.message import (
     DEFAULT_ATTACHMENT_MIME_TYPE, make_msgid,
     BadHeaderError, forbid_multi_line_headers)
 
+__all__ = [
+    'CachedDnsName', 'DNS_NAME', 'EmailMessage', 'EmailMultiAlternatives',
+    'SafeMIMEText', 'SafeMIMEMultipart', 'DEFAULT_ATTACHMENT_MIME_TYPE',
+    'make_msgid', 'BadHeaderError', 'forbid_multi_line_headers',
+    'get_connection', 'send_mail', 'send_mass_mail', 'mail_admins',
+    'mail_managers',
+]
+
 
 def get_connection(backend=None, fail_silently=False, **kwds):
     """Load an email backend and return an instance of it.

django/core/management/base.py

@@ -265,7 +265,7 @@ class BaseCommand(object):
             self.stderr = OutputWrapper(options.get('stderr', sys.stderr), self.style.ERROR)
 
         if self.can_import_settings:
-            from django.conf import settings
+            from django.conf import settings  # NOQA
 
         saved_locale = None
         if not self.leave_locale_alone:

django/core/management/commands/squashmigrations.py

@@ -1,16 +1,12 @@
 import sys
-import os
 from optparse import make_option
 
 from django.core.management.base import BaseCommand, CommandError
-from django.core.exceptions import ImproperlyConfigured
 from django.utils import six
 from django.db import connections, DEFAULT_DB_ALIAS, migrations
-from django.db.migrations.loader import MigrationLoader, AmbiguityError
+from django.db.migrations.loader import AmbiguityError
-from django.db.migrations.autodetector import MigrationAutodetector, InteractiveMigrationQuestioner
 from django.db.migrations.executor import MigrationExecutor
 from django.db.migrations.writer import MigrationWriter
-from django.db.models.loading import cache
 from django.db.migrations.optimizer import MigrationOptimizer
 
 

django/core/management/validation.py

@@ -122,7 +122,7 @@ def get_validation_errors(outfile, app=None):
                         e.add(opts, invalid_values_msg % f.name)
             if isinstance(f, models.ImageField):
                 try:
-                    from django.utils.image import Image
+                    from django.utils.image import Image  # NOQA
                 except ImportError:
                     e.add(opts, '"%s": To use ImageFields, you need to install Pillow. Get it at https://pypi.python.org/pypi/Pillow.' % f.name)
             if isinstance(f, models.BooleanField) and getattr(f, 'null', False):

django/core/servers/basehttp.py

@@ -14,12 +14,11 @@ import socket
 import sys
 import traceback
 from wsgiref import simple_server
-from wsgiref.util import FileWrapper   # for backwards compatibility
+from wsgiref.util import FileWrapper   # NOQA: for backwards compatibility
 
 from django.core.management.color import color_style
 from django.core.wsgi import get_wsgi_application
 from django.utils.module_loading import import_by_path
-from django.utils import six
 from django.utils.six.moves.urllib.parse import urljoin
 from django.utils.six.moves import socketserver
 

django/core/servers/fastcgi.py

@@ -101,7 +101,7 @@ def runfastcgi(argset=[], **kwargs):
         return fastcgi_help()
 
     try:
-        import flup
+        import flup  # NOQA
     except ImportError as e:
         sys.stderr.write("ERROR: %s\n" % e)
         sys.stderr.write("  Unable to load the flup package.  In order to run django\n")

django/db/migrations/__init__.py

@@ -1,2 +1,2 @@
-from .migration import Migration
+from .migration import Migration  # NOQA
-from .operations import *
+from .operations import *  # NOQA

django/db/migrations/operations/__init__.py

@@ -1,3 +1,11 @@
-from .models import CreateModel, DeleteModel, AlterModelTable, AlterUniqueTogether, AlterIndexTogether
+from .models import (CreateModel, DeleteModel, AlterModelTable,
+    AlterUniqueTogether, AlterIndexTogether)
 from .fields import AddField, RemoveField, AlterField, RenameField
 from .special import SeparateDatabaseAndState, RunSQL, RunPython
+
+__all__ = [
+    'CreateModel', 'DeleteModel', 'AlterModelTable', 'AlterUniqueTogether',
+    'AlterIndexTogether',
+    'AddField', 'RemoveField', 'AlterField', 'RenameField',
+    'SeparateDatabaseAndState', 'RunSQL', 'RunPython',
+]

django/db/models/__init__.py

@@ -1,18 +1,23 @@
 from functools import wraps
 
-from django.core.exceptions import ObjectDoesNotExist, ImproperlyConfigured
+from django.core.exceptions import ObjectDoesNotExist, ImproperlyConfigured  # NOQA
-from django.db.models.loading import get_apps, get_app_path, get_app_paths, get_app, get_models, get_model, register_models, UnavailableApp
+from django.db.models.loading import (  # NOQA
-from django.db.models.query import Q, QuerySet
+    get_apps, get_app_path, get_app_paths, get_app, get_models, get_model,
-from django.db.models.expressions import F
+    register_models, UnavailableApp)
-from django.db.models.manager import Manager
+from django.db.models.query import Q, QuerySet  # NOQA
-from django.db.models.base import Model
+from django.db.models.expressions import F  # NOQA
-from django.db.models.aggregates import *
+from django.db.models.manager import Manager  # NOQA
-from django.db.models.fields import *
+from django.db.models.base import Model  # NOQA
-from django.db.models.fields.subclassing import SubfieldBase
+from django.db.models.aggregates import *  # NOQA
-from django.db.models.fields.files import FileField, ImageField
+from django.db.models.fields import *  # NOQA
-from django.db.models.fields.related import ForeignKey, ForeignObject, OneToOneField, ManyToManyField, ManyToOneRel, ManyToManyRel, OneToOneRel
+from django.db.models.fields.subclassing import SubfieldBase        # NOQA
-from django.db.models.deletion import CASCADE, PROTECT, SET, SET_NULL, SET_DEFAULT, DO_NOTHING, ProtectedError
+from django.db.models.fields.files import FileField, ImageField # NOQA
-from django.db.models import signals
+from django.db.models.fields.related import (  # NOQA
+    ForeignKey, ForeignObject, OneToOneField, ManyToManyField,
+    ManyToOneRel, ManyToManyRel, OneToOneRel)
+from django.db.models.deletion import (  # NOQA
+    CASCADE, PROTECT, SET, SET_NULL, SET_DEFAULT, DO_NOTHING, ProtectedError)
+from django.db.models import signals  # NOQA
 
 
 def permalink(func):

django/db/models/aggregates.py

@@ -3,6 +3,10 @@ Classes to represent the definitions of aggregate functions.
 """
 from django.db.models.constants import LOOKUP_SEP
 
+__all__ = [
+    'Aggregate', 'Avg', 'Count', 'Max', 'Min', 'StdDev', 'Sum', 'Variance',
+]
+
 
 def refs_aggregate(lookup_parts, aggregates):
     """

django/db/models/base.py

@@ -5,7 +5,7 @@ import sys
 from functools import update_wrapper
 from django.utils.six.moves import zip
 
-import django.db.models.manager  # Imported to register signal handler.
+import django.db.models.manager  # NOQA: Imported to register signal handler.
 from django.conf import settings
 from django.core.exceptions import (ObjectDoesNotExist,
     MultipleObjectsReturned, FieldError, ValidationError, NON_FIELD_ERRORS)
@@ -19,7 +19,7 @@ from django.db.models.query_utils import DeferredAttribute, deferred_class_facto
 from django.db.models.deletion import Collector
 from django.db.models.options import Options
 from django.db.models import signals
-from django.db.models.loading import register_models, get_model, MODELS_MODULE_NAME
+from django.db.models.loading import get_model, MODELS_MODULE_NAME
 from django.utils.translation import ugettext_lazy as _
 from django.utils.functional import curry
 from django.utils.encoding import force_str, force_text

django/db/models/fields/__init__.py

@@ -25,6 +25,18 @@ from django.utils.encoding import smart_text, force_text, force_bytes
 from django.utils.ipv6 import clean_ipv6_address
 from django.utils import six
 
+# Avoid "TypeError: Item in ``from list'' not a string" -- unicode_literals
+# makes these strings unicode
+__all__ = [str(x) for x in (
+    'AutoField', 'BLANK_CHOICE_DASH', 'BigIntegerField', 'BinaryField',
+    'BooleanField', 'CharField', 'CommaSeparatedIntegerField', 'DateField',
+    'DateTimeField', 'DecimalField', 'EmailField', 'Empty', 'Field',
+    'FieldDoesNotExist', 'FilePathField', 'FloatField',
+    'GenericIPAddressField', 'IPAddressField', 'IntegerField', 'NOT_PROVIDED',
+    'NullBooleanField', 'PositiveIntegerField', 'PositiveSmallIntegerField',
+    'SlugField', 'SmallIntegerField', 'TextField', 'TimeField', 'URLField',
+)]
+
 
 class Empty(object):
     pass

django/db/models/query.py

@@ -8,7 +8,7 @@ import sys
 
 from django.conf import settings
 from django.core import exceptions
-from django.db import connections, router, transaction, DatabaseError, IntegrityError
+from django.db import connections, router, transaction, IntegrityError
 from django.db.models.constants import LOOKUP_SEP
 from django.db.models.fields import AutoField, Empty
 from django.db.models.query_utils import (Q, select_related_descend,

django/db/models/sql/__init__.py

@@ -1,6 +1,6 @@
 from django.db.models.sql.datastructures import EmptyResultSet
-from django.db.models.sql.subqueries import *
+from django.db.models.sql.subqueries import *  # NOQA
-from django.db.models.sql.query import *
+from django.db.models.sql.query import *  # NOQA
 from django.db.models.sql.where import AND, OR
 
 

django/db/utils.py

@@ -1,4 +1,3 @@
-from functools import wraps
 from importlib import import_module
 import os
 import pkgutil

django/dispatch/__init__.py

@@ -6,4 +6,4 @@ See license.txt for original license.
 Heavily modified for Django's purposes.
 """
 
-from django.dispatch.dispatcher import Signal, receiver
+from django.dispatch.dispatcher import Signal, receiver  # NOQA

django/forms/__init__.py

@@ -2,8 +2,8 @@
 Django validation and HTML form handling.
 """
 
-from django.core.exceptions import ValidationError
+from django.core.exceptions import ValidationError  # NOQA
-from django.forms.fields import *
+from django.forms.fields import *  # NOQA
-from django.forms.forms import *
+from django.forms.forms import *  # NOQA
-from django.forms.models import *
+from django.forms.models import *  # NOQA
-from django.forms.widgets import *
+from django.forms.widgets import *  # NOQA

django/forms/extras/__init__.py

@@ -1 +1,3 @@
-from django.forms.extras.widgets import *
+from django.forms.extras.widgets import SelectDateWidget
+
+__all__ = ['SelectDateWidget']

django/forms/fields.py

@@ -30,7 +30,7 @@ from django.utils.six.moves.urllib.parse import urlsplit, urlunsplit
 from django.utils.translation import ugettext_lazy as _, ungettext_lazy
 
 # Provide this import for backwards compatibility.
-from django.core.validators import EMPTY_VALUES
+from django.core.validators import EMPTY_VALUES  # NOQA
 
 
 __all__ = (

django/forms/widgets.py

@@ -15,7 +15,7 @@ from django.utils.html import conditional_escape, format_html
 from django.utils.translation import ugettext_lazy
 from django.utils.encoding import force_text, python_2_unicode_compatible
 from django.utils.safestring import mark_safe
-from django.utils import datetime_safe, formats, six
+from django.utils import formats, six
 from django.utils.six.moves.urllib.parse import urljoin
 
 __all__ = (

django/http/__init__.py

@@ -1,10 +1,21 @@
 from django.http.cookie import SimpleCookie, parse_cookie
-from django.http.request import (HttpRequest, QueryDict, RawPostDataException,
+from django.http.request import (HttpRequest, QueryDict,
-    UnreadablePostError, build_request_repr)
+    RawPostDataException, UnreadablePostError, build_request_repr)
 from django.http.response import (HttpResponse, StreamingHttpResponse,
     HttpResponseRedirect, HttpResponsePermanentRedirect,
     HttpResponseNotModified, HttpResponseBadRequest, HttpResponseForbidden,
     HttpResponseNotFound, HttpResponseNotAllowed, HttpResponseGone,
     HttpResponseServerError, Http404, BadHeaderError)
-from django.http.utils import (fix_location_header, conditional_content_removal,
+from django.http.utils import (fix_location_header,
-    fix_IE_for_attach, fix_IE_for_vary)
+    conditional_content_removal, fix_IE_for_attach, fix_IE_for_vary)
+
+__all__ = [
+    'SimpleCookie', 'parse_cookie', 'HttpRequest', 'QueryDict',
+    'RawPostDataException', 'UnreadablePostError', 'build_request_repr',
+    'HttpResponse', 'StreamingHttpResponse', 'HttpResponseRedirect',
+    'HttpResponsePermanentRedirect', 'HttpResponseNotModified',
+    'HttpResponseBadRequest', 'HttpResponseForbidden', 'HttpResponseNotFound',
+    'HttpResponseNotAllowed', 'HttpResponseGone', 'HttpResponseServerError',
+    'Http404', 'BadHeaderError', 'fix_location_header',
+    'conditional_content_removal', 'fix_IE_for_attach', 'fix_IE_for_vary',
+]

django/middleware/doc.py

@@ -3,4 +3,4 @@
 import warnings
 warnings.warn(__doc__, DeprecationWarning, stacklevel=2)
 
-from django.contrib.admindocs.middleware import XViewMiddleware
+from django.contrib.admindocs.middleware import XViewMiddleware  # NOQA

django/template/__init__.py

@@ -50,7 +50,7 @@ u'<html></html>'
 """
 
 # Template lexing symbols
-from django.template.base import (ALLOWED_VARIABLE_CHARS, BLOCK_TAG_END,
+from django.template.base import (ALLOWED_VARIABLE_CHARS, BLOCK_TAG_END,  # NOQA
     BLOCK_TAG_START, COMMENT_TAG_END, COMMENT_TAG_START,
     FILTER_ARGUMENT_SEPARATOR, FILTER_SEPARATOR, SINGLE_BRACE_END,
     SINGLE_BRACE_START, TOKEN_BLOCK, TOKEN_COMMENT, TOKEN_TEXT, TOKEN_VAR,
@@ -58,22 +58,22 @@ from django.template.base import (ALLOWED_VARIABLE_CHARS, BLOCK_TAG_END,
     VARIABLE_TAG_END, VARIABLE_TAG_START, filter_re, tag_re)
 
 # Exceptions
-from django.template.base import (ContextPopException, InvalidTemplateLibrary,
+from django.template.base import (ContextPopException, InvalidTemplateLibrary,  # NOQA
     TemplateDoesNotExist, TemplateEncodingError, TemplateSyntaxError,
     VariableDoesNotExist)
 
 # Template parts
-from django.template.base import (Context, FilterExpression, Lexer, Node,
+from django.template.base import (Context, FilterExpression, Lexer, Node,  # NOQA
     NodeList, Parser, RequestContext, Origin, StringOrigin, Template,
     TextNode, Token, TokenParser, Variable, VariableNode, constant_string,
     filter_raw_string)
 
 # Compiling templates
-from django.template.base import (compile_string, resolve_variable,
+from django.template.base import (compile_string, resolve_variable,  # NOQA
     unescape_string_literal, generic_tag_compiler)
 
 # Library management
-from django.template.base import (Library, add_to_builtins, builtins,
+from django.template.base import (Library, add_to_builtins, builtins,  # NOQA
     get_library, get_templatetags_modules, get_text_list, import_library,
     libraries)
 

django/template/base.py

@@ -6,7 +6,7 @@ from importlib import import_module
 from inspect import getargspec, getcallargs
 
 from django.conf import settings
-from django.template.context import (BaseContext, Context, RequestContext,
+from django.template.context import (BaseContext, Context, RequestContext,  # NOQA: imported for backwards compatability
     ContextPopException)
 from django.utils.itercompat import is_iterable
 from django.utils.text import (smart_split, unescape_string_literal,

django/test/__init__.py

@@ -8,3 +8,9 @@ from django.test.testcases import (TestCase, TransactionTestCase,
     skipUnlessDBFeature
 )
 from django.test.utils import override_settings
+
+__all__ = [
+    'Client', 'RequestFactory', 'TestCase', 'TransactionTestCase',
+    'SimpleTestCase', 'LiveServerTestCase', 'skipIfDBFeature',
+    'skipUnlessDBFeature', 'override_settings',
+]

django/test/testcases.py

@@ -12,7 +12,7 @@ import socket
 import sys
 import threading
 import unittest
-from unittest import skipIf         # Imported here for backward compatibility
+from unittest import skipIf         # NOQA: Imported here for backward compatibility
 from unittest.util import safe_repr
 
 from django.conf import settings

django/utils/autoreload.py

@@ -44,7 +44,7 @@ except ImportError:
 # This import does nothing, but it's necessary to avoid some race conditions
 # in the threading module. See http://code.djangoproject.com/ticket/2330 .
 try:
-    import threading
+    import threading  # NOQA
 except ImportError:
     pass
 

django/utils/log.py

@@ -1,5 +1,4 @@
 import logging
-import traceback
 
 from django.conf import settings
 from django.core import mail
@@ -7,8 +6,8 @@ from django.core.mail import get_connection
 from django.views.debug import ExceptionReporter, get_exception_reporter_filter
 
 # Imports kept for backwards-compatibility in Django 1.7.
-from logging import NullHandler
+from logging import NullHandler  # NOQA
-from logging.config import dictConfig
+from logging.config import dictConfig  # NOQA
 
 getLogger = logging.getLogger
 

django/utils/text.py

@@ -15,7 +15,7 @@ from django.utils.safestring import mark_safe
 if six.PY2:
     # Import force_unicode even though this module doesn't use it, because some
     # people rely on it being here.
-    from django.utils.encoding import force_unicode
+    from django.utils.encoding import force_unicode  # NOQA
 
 # Capitalizes the first letter of a string.
 capfirst = lambda x: x and force_text(x)[0].upper() + force_text(x)[1:]

django/views/generic/__init__.py

@@ -7,6 +7,14 @@ from django.views.generic.edit import FormView, CreateView, UpdateView, DeleteVi
 from django.views.generic.list import ListView
 
 
+__all__ = [
+    'View', 'TemplateView', 'RedirectView', 'ArchiveIndexView',
+    'YearArchiveView', 'MonthArchiveView', 'WeekArchiveView', 'DayArchiveView',
+    'TodayArchiveView', 'DateDetailView', 'DetailView', 'FormView',
+    'CreateView', 'UpdateView', 'DeleteView', 'ListView', 'GenericViewError',
+]
+
+
 class GenericViewError(Exception):
     """A problem in a generic view."""
     pass

setup.cfg

@@ -3,8 +3,8 @@ doc_files = docs extras AUTHORS INSTALL LICENSE README.rst
 install-script = scripts/rpm-install.sh
 
 [flake8]
-exclude=./django/utils/dictconfig.py,./django/contrib/comments/*,./django/utils/unittest.py,./tests/comment_tests/*,./django/test/_doctest.py,./django/utils/six.py
+exclude=./django/utils/dictconfig.py,./django/contrib/comments/*,./django/utils/unittest.py,./tests/comment_tests/*,./django/test/_doctest.py,./django/utils/six.py,./django/conf/app_template/*
-ignore=E124,E125,E127,E128,E226,E241,E251,E302,E501,E261,F401,F403,W601
+ignore=E124,E125,E127,E128,E226,E241,E251,E302,E501,E261,W601
 
 [metadata]
 license-file = LICENSE

tests/admin_changelist/admin.py

@@ -1,8 +1,7 @@
 from django.contrib import admin
 from django.core.paginator import Paginator
 
-from .models import (Event, Child, Parent, Genre, Band, Musician, Group,
+from .models import Event, Child, Parent, Swallow
-    Quartet, Membership, ChordsMusician, ChordsBand, Invitation, Swallow)
 
 
 site = admin.AdminSite(name="admin")

tests/admin_custom_urls/tests.py

@@ -1,5 +1,4 @@
 from __future__ import unicode_literals
-import warnings
 
 from django.contrib.admin.utils import quote
 from django.core.urlresolvers import reverse

tests/admin_scripts/broken_app/models.py

@@ -1 +1 @@
-from django.db import modelz
+from django.db import modelz  # NOQA

tests/admin_scripts/complex_app/models/bar.py

@@ -1,7 +1,5 @@
 from django.db import models
 
-from ..admin import foo
-
 
 class Bar(models.Model):
     name = models.CharField(max_length=5)

tests/admin_scripts/simple_app/models.py

@@ -1 +1,3 @@
 from ..complex_app.models.bar import Bar
+
+__all__ = ['Bar']

tests/admin_validation/tests.py

@@ -6,7 +6,7 @@ from django.core.exceptions import ImproperlyConfigured
 from django.test import TestCase
 from django.test.utils import str_prefix
 
-from .models import Song, Book, Album, TwoAlbumFKAndAnE, State, City
+from .models import Song, Book, Album, TwoAlbumFKAndAnE, City
 
 
 class SongForm(forms.ModelForm):

tests/admin_views/tests.py

@@ -3419,7 +3419,6 @@ class SeleniumAdminViewsFirefoxTests(AdminSeleniumWebDriverTestCase):
         main form and with stacked and tabular inlines.
         Refs #13068, #9264, #9983, #9784.
         """
-        from selenium.common.exceptions import TimeoutException
         self.admin_login(username='super', password='secret', login_url='/test_admin/admin/')
         self.selenium.get('%s%s' % (self.live_server_url,
             '/test_admin/admin/admin_views/mainprepopulated/add/'))

tests/app_loading/tests.py

@@ -3,10 +3,8 @@ from __future__ import unicode_literals
 import copy
 import os
 import sys
-import time
 from unittest import TestCase
 
-from django.conf import Settings
 from django.db.models.loading import cache, load_app, get_model, get_models, AppCache
 from django.test.utils import override_settings
 from django.utils._os import upath

tests/context_processors/urls.py

@@ -1,4 +1,4 @@
-from django.conf.urls import patterns, url
+from django.conf.urls import patterns
 
 from . import views
 

tests/delete/tests.py

@@ -4,7 +4,7 @@ from django.db import models, IntegrityError, connection
 from django.test import TestCase, skipUnlessDBFeature, skipIfDBFeature
 from django.utils.six.moves import xrange
 
-from .models import (R, RChild, S, T, U, A, M, MR, MRNull,
+from .models import (R, RChild, S, T, A, M, MR, MRNull,
     create_a, get_default_r, User, Avatar, HiddenUser, HiddenUserProfile,
     M2MTo, M2MFrom, Parent, Child, Base)
 

tests/deprecation/tests.py

@@ -3,7 +3,6 @@ import warnings
 
 from django.test import SimpleTestCase, RequestFactory
 from django.utils import six
-from django.utils.datastructures import MergeDict
 from django.utils.deprecation import RenameMethodsBase
 
 

tests/file_storage/tests.py

@@ -15,7 +15,6 @@ try:
 except ImportError:
     import dummy_threading as threading
 
-from django.conf import settings
 from django.core.cache import cache
 from django.core.exceptions import SuspiciousOperation, ImproperlyConfigured
 from django.core.files.base import File, ContentFile

tests/files/tests.py

@@ -4,7 +4,6 @@ from __future__ import unicode_literals
 from io import BytesIO
 import os
 import gzip
-import shutil
 import tempfile
 import unittest
 import zlib
@@ -15,7 +14,6 @@ from django.core.files.move import file_move_safe
 from django.core.files.base import ContentFile
 from django.core.files.uploadedfile import SimpleUploadedFile, UploadedFile
 from django.core.files.temp import NamedTemporaryFile
-from django.test import TestCase
 from django.utils._os import upath
 from django.utils import six
 

tests/forms_tests/urls.py

@@ -1,5 +1,4 @@
 from django.conf.urls import patterns, url
-from django.views.generic.edit import UpdateView
 
 from .views import ArticleFormView
 

tests/generic_inline_admin/tests.py

@@ -2,7 +2,6 @@
 from __future__ import unicode_literals
 import warnings
 
-from django.conf import settings
 from django.contrib import admin
 from django.contrib.admin.sites import AdminSite
 from django.contrib.contenttypes.generic import (

tests/i18n/tests.py

@@ -16,7 +16,7 @@ from django.test.utils import override_settings, TransRealMixin
 from django.utils import translation
 from django.utils.formats import (get_format, date_format, time_format,
     localize, localize_input, iter_format_modules, get_format_modules,
-    number_format, reset_format_cache, sanitize_separators)
+    reset_format_cache, sanitize_separators)
 from django.utils.numberformat import format as nformat
 from django.utils._os import upath
 from django.utils.safestring import mark_safe, SafeBytes, SafeString, SafeText
@@ -25,11 +25,11 @@ from django.utils.six import PY3
 from django.utils.translation import (activate, deactivate,
     get_language,  get_language_from_request, get_language_info,
     to_locale, trans_real,
-    gettext, gettext_lazy,
+    gettext_lazy,
     ugettext, ugettext_lazy,
-    ngettext, ngettext_lazy,
+    ngettext_lazy,
-    ungettext, ungettext_lazy,
+    ungettext_lazy,
-    pgettext, pgettext_lazy,
+    pgettext,
     npgettext, npgettext_lazy,
     check_for_language)
 

tests/logging_tests/tests.py

@@ -1,9 +1,6 @@
 from __future__ import unicode_literals
 
-import copy
 import logging
-import sys
-from unittest import skipUnless
 import warnings
 
 from django.conf import LazySettings

tests/managers_regress/tests.py

@@ -1,7 +1,6 @@
 from __future__ import unicode_literals
 import copy
 
-from django.conf import settings
 from django.db import models
 from django.db.models.loading import cache
 from django.template import Context, Template

tests/many_to_one_regress/tests.py

@@ -2,7 +2,6 @@ from __future__ import unicode_literals
 
 from django.db import models
 from django.test import TestCase
-from django.utils import six
 
 from .models import (
     First, Third, Parent, Child, Category, Record, Relation, Car, Driver)

tests/middleware/tests.py

@@ -5,7 +5,7 @@ import gzip
 from io import BytesIO
 import random
 import re
-from unittest import expectedFailure, skipIf
+from unittest import skipIf
 import warnings
 
 from django.conf import settings

tests/migrations/faulty_migrations/import_error/__init__.py

@@ -1 +1 @@
-import fake_python_module
+import fake_python_module  # NOQA

tests/migrations/test_executor.py

@@ -1,4 +1,3 @@
-from django.test import TransactionTestCase
 from django.test.utils import override_settings
 from django.db import connection
 from django.db.migrations.executor import MigrationExecutor

tests/migrations/test_optimizer.py

@@ -1,5 +1,4 @@
 # encoding: utf8
-import operator
 from django.test import TestCase
 from django.db.migrations.optimizer import MigrationOptimizer
 from django.db import migrations

tests/model_forms/models.py

@@ -102,7 +102,7 @@ class TextFile(models.Model):
         return self.description
 
 try:
-    from django.utils.image import Image
+    from django.utils.image import Image  # NOQA: detect if Pillow is installed
 
     test_images = True
 

tests/model_package/models/__init__.py

@@ -1,3 +1,5 @@
 # Import all the models from subpackages
 from .article import Article
 from .publication import Publication
+
+__all__ = ['Article', 'Publication']

tests/modeladmin/tests.py

@@ -4,7 +4,6 @@ from datetime import date
 import unittest
 
 from django import forms
-from django.conf import settings
 from django.contrib.admin.options import (ModelAdmin, TabularInline,
      HORIZONTAL, VERTICAL)
 from django.contrib.admin.sites import AdminSite

tests/proxy_models/tests.py

@@ -1,7 +1,6 @@
 from __future__ import unicode_literals
 import copy
 
-from django.conf import settings
 from django.contrib import admin
 from django.contrib.contenttypes.models import ContentType
 from django.core import management
@@ -17,7 +16,7 @@ from .models import (MyPerson, Person, StatusPerson, LowerStatusPerson,
     MyPersonProxy, Abstract, OtherPerson, User, UserProxy, UserProxyProxy,
     Country, State, StateProxy, TrackerUser, BaseUser, Bug, ProxyTrackerUser,
     Improvement, ProxyProxyBug, ProxyBug, ProxyImprovement, Issue)
-from .admin import admin as force_admin_model_registration
+from .admin import admin as force_admin_model_registration  # NOQA
 
 
 class ProxyModelTests(TestCase):

tests/queryset_pickle/tests.py

@@ -3,7 +3,6 @@ from __future__ import unicode_literals
 import pickle
 import datetime
 
-from django.db import models
 from django.test import TestCase
 
 from .models import Group, Event, Happening, Container, M2MModel

tests/requests/tests.py

@@ -6,9 +6,8 @@ from io import BytesIO
 from itertools import chain
 import time
 from unittest import skipIf
-import warnings
 
-from django.db import connection, connections, DEFAULT_DB_ALIAS
+from django.db import connection, connections
 from django.core import signals
 from django.core.exceptions import SuspiciousOperation
 from django.core.handlers.wsgi import WSGIRequest, LimitedStream

tests/select_for_update/tests.py

@@ -1,6 +1,5 @@
 from __future__ import unicode_literals
 
-import sys
 import time
 import unittest
 

tests/select_related_regress/tests.py

@@ -5,7 +5,7 @@ from django.utils import six
 
 from .models import (Building, Child, Device, Port, Item, Country, Connection,
     ClientStatus, State, Client, SpecialClient, TUser, Person, Student,
-    Organizer, Class, Enrollment, Hen, Chick, Base, A, B, C)
+    Organizer, Class, Enrollment, Hen, Chick, A, B, C)
 
 
 class SelectRelatedRegressTests(TestCase):

tests/serializers/tests.py

@@ -14,7 +14,6 @@ except ImportError:
     HAS_YAML = False
 
 
-from django.conf import settings
 from django.core import management, serializers
 from django.db import transaction, connection
 from django.test import TestCase, TransactionTestCase

tests/serializers_regress/tests.py

@@ -26,7 +26,6 @@ from django.db import connection, models
 from django.http import HttpResponse
 from django.test import TestCase
 from django.utils import six
-from django.utils.encoding import force_text
 from django.utils.functional import curry
 
 from .models import (BinaryData, BooleanData, CharData, DateData, DateTimeData, EmailData,

tests/settings_tests/tests.py

@@ -1,8 +1,7 @@
-import os
 import unittest
 import warnings
 
-from django.conf import settings, global_settings
+from django.conf import settings
 from django.core.exceptions import ImproperlyConfigured
 from django.http import HttpRequest
 from django.test import SimpleTestCase, TransactionTestCase, TestCase, signals

tests/tablespaces/tests.py

@@ -4,7 +4,6 @@ import copy
 
 from django.conf import settings
 from django.db import connection
-from django.db import models
 from django.db.models.loading import cache
 from django.core.management.color import no_style
 from django.test import TestCase, skipIfDBFeature, skipUnlessDBFeature

tests/template_tests/templatetags/broken_tag.py

@@ -1 +1 @@
-from django import Xtemplate
+from django import Xtemplate  # NOQA

tests/template_tests/templatetags/subpackage/echo_invalid.py

@@ -1 +1 @@
-import nonexistent.module
+import nonexistent.module  # NOQA

tests/test_client/tests.py

@@ -22,7 +22,6 @@ rather than the HTML rendered to the end-user.
 """
 from __future__ import unicode_literals
 
-from django.conf import settings
 from django.core import mail
 from django.test import Client, TestCase, RequestFactory
 from django.test.utils import override_settings
@@ -430,7 +429,6 @@ class ClientTest(TestCase):
         except KeyError:
             pass
 
-        from django.contrib.sessions.models import Session
         self.client.post('/test_client/session_view/')
 
         # Check that the session was modified

tests/test_runner/test_discover_runner.py

@@ -1,6 +1,5 @@
 from contextlib import contextmanager
 import os
-import sys
 from unittest import expectedFailure, TestSuite, TextTestRunner, defaultTestLoader
 
 from django.test import TestCase

tests/test_runner/tests.py

@@ -5,7 +5,6 @@ from __future__ import unicode_literals
 
 from importlib import import_module
 from optparse import make_option
-import sys
 import unittest
 
 from django.core.exceptions import ImproperlyConfigured