[1.8.x] Sorted imports with isort; refs #23860.

Backport of 0ed7d155635da9f79d4dd67e4889087d3673c6da from master

7 files changed, 23 insertions, 17 deletions

diff --git a/django/core/cache/backends/base.py b/django/core/cache/backends/base.py
index 4b7806fc29..7ac1e5bc32 100644
--- a/django/core/cache/backends/base.py
+++ b/django/core/cache/backends/base.py
@@ -4,7 +4,7 @@ from __future__ import unicode_literals
 import time
 import warnings
 
-from django.core.exceptions import ImproperlyConfigured, DjangoRuntimeWarning
+from django.core.exceptions import DjangoRuntimeWarning, ImproperlyConfigured
 from django.utils.module_loading import import_string
 
 
diff --git a/django/core/cache/backends/db.py b/django/core/cache/backends/db.py
index 99ce96d49e..f016179491 100644
--- a/django/core/cache/backends/db.py
+++ b/django/core/cache/backends/db.py
@@ -2,18 +2,18 @@
 import base64
 from datetime import datetime
 
+from django.conf import settings
+from django.core.cache.backends.base import DEFAULT_TIMEOUT, BaseCache
+from django.db import DatabaseError, connections, router, transaction
+from django.db.backends.utils import typecast_timestamp
+from django.utils import six, timezone
+from django.utils.encoding import force_bytes
+
 try:
     from django.utils.six.moves import cPickle as pickle
 except ImportError:
     import pickle
 
-from django.conf import settings
-from django.core.cache.backends.base import BaseCache, DEFAULT_TIMEOUT
-from django.db import connections, transaction, router, DatabaseError
-from django.db.backends.utils import typecast_timestamp
-from django.utils import timezone, six
-from django.utils.encoding import force_bytes
-
 
 class Options(object):
     """A class that will quack like a Django model _meta class.
diff --git a/django/core/cache/backends/dummy.py b/django/core/cache/backends/dummy.py
index eb21feebdf..d1aea0a325 100644
--- a/django/core/cache/backends/dummy.py
+++ b/django/core/cache/backends/dummy.py
@@ -1,6 +1,6 @@
 "Dummy cache backend"
 
-from django.core.cache.backends.base import BaseCache, DEFAULT_TIMEOUT
+from django.core.cache.backends.base import DEFAULT_TIMEOUT, BaseCache
 
 
 class DummyCache(BaseCache):
diff --git a/django/core/cache/backends/filebased.py b/django/core/cache/backends/filebased.py
index 94fdfa9ed7..c35efce92c 100644
--- a/django/core/cache/backends/filebased.py
+++ b/django/core/cache/backends/filebased.py
@@ -8,9 +8,11 @@ import random
 import tempfile
 import time
 import zlib
-from django.core.cache.backends.base import BaseCache, DEFAULT_TIMEOUT
+
+from django.core.cache.backends.base import DEFAULT_TIMEOUT, BaseCache
 from django.core.files.move import file_move_safe
 from django.utils.encoding import force_bytes
+
 try:
     from django.utils.six.moves import cPickle as pickle
 except ImportError:
diff --git a/django/core/cache/backends/locmem.py b/django/core/cache/backends/locmem.py
index edf0ff22a7..8916ad176c 100644
--- a/django/core/cache/backends/locmem.py
+++ b/django/core/cache/backends/locmem.py
@@ -1,15 +1,16 @@
 "Thread-safe in-memory cache backend."
 
-from contextlib import contextmanager
 import time
+from contextlib import contextmanager
+
+from django.core.cache.backends.base import DEFAULT_TIMEOUT, BaseCache
+from django.utils.synch import RWLock
+
 try:
     from django.utils.six.moves import cPickle as pickle
 except ImportError:
     import pickle
 
-from django.core.cache.backends.base import BaseCache, DEFAULT_TIMEOUT
-from django.utils.synch import RWLock
-
 
 # Global in-memory store of cache data. Keyed by name, to provide
 # multiple named local memory caches.
diff --git a/django/core/cache/backends/memcached.py b/django/core/cache/backends/memcached.py
index 87f05f973b..a2af9045dc 100644
--- a/django/core/cache/backends/memcached.py
+++ b/django/core/cache/backends/memcached.py
@@ -1,11 +1,13 @@
 "Memcached cache backend"
 
-import time
 import pickle
+import time
 
-from django.core.cache.backends.base import BaseCache, DEFAULT_TIMEOUT
+from django.core.cache.backends.base import DEFAULT_TIMEOUT, BaseCache
 from django.utils import six
-from django.utils.deprecation import RenameMethodsBase, RemovedInDjango19Warning
+from django.utils.deprecation import (
+    RemovedInDjango19Warning, RenameMethodsBase,
+)
 from django.utils.encoding import force_str
 from django.utils.functional import cached_property
 
diff --git a/django/core/cache/utils.py b/django/core/cache/utils.py
index dd9ad4abd1..c40e4eba0c 100644
--- a/django/core/cache/utils.py
+++ b/django/core/cache/utils.py
@@ -1,6 +1,7 @@
 from __future__ import unicode_literals
 
 import hashlib
+
 from django.utils.encoding import force_bytes
 from django.utils.http import urlquote