4 files changed, 4 insertions, 7 deletions
diff --git a/django/db/backends/base/base.py b/django/db/backends/base/base.py
index cbc4983046..460fceab71 100644
--- a/django/db/backends/base/base.py
+++ b/django/db/backends/base/base.py
@@ -1,18 +1,17 @@
-from collections import deque
-from contextlib import contextmanager
 import time
 import warnings
+from collections import deque
+from contextlib import contextmanager
 
 from django.conf import settings
 from django.db import DEFAULT_DB_ALIAS
-from django.db.backends.signals import connection_created
 from django.db.backends import utils
+from django.db.backends.signals import connection_created
 from django.db.transaction import TransactionManagementError
 from django.db.utils import DatabaseError, DatabaseErrorWrapper
 from django.utils.functional import cached_property
 from django.utils.six.moves import _thread as thread
 
-
 NO_DB_ALIAS = '__no_db__'
 
 
diff --git a/django/db/backends/base/creation.py b/django/db/backends/base/creation.py
index 30e094cfe7..854e17b6c2 100644
--- a/django/db/backends/base/creation.py
+++ b/django/db/backends/base/creation.py
@@ -8,7 +8,6 @@ from django.db import router
 from django.utils.six import StringIO
 from django.utils.six.moves import input
 
-
 # The prefix to put on the default database name when creating
 # the test database.
 TEST_DATABASE_PREFIX = 'test_'
diff --git a/django/db/backends/base/introspection.py b/django/db/backends/base/introspection.py
index d20bfa1df0..5f828b94cc 100644
--- a/django/db/backends/base/introspection.py
+++ b/django/db/backends/base/introspection.py
@@ -2,7 +2,6 @@ from collections import namedtuple
 
 from django.utils import six
 
-
 # Structure returned by DatabaseIntrospection.get_table_list()
 TableInfo = namedtuple('TableInfo', ['name', 'type'])
 
diff --git a/django/db/backends/base/operations.py b/django/db/backends/base/operations.py
index 50f6c93a07..aebe4312c8 100644
--- a/django/db/backends/base/operations.py
+++ b/django/db/backends/base/operations.py
@@ -1,7 +1,7 @@
 import datetime
 import decimal
-from importlib import import_module
 import warnings
+from importlib import import_module
 
 from django.conf import settings
 from django.core.exceptions import ImproperlyConfigured