diff --git a/django/db/models/functions/__init__.py b/django/db/models/functions/__init__.py
index 01e1c5f6d7..14f1f69d01 100644
--- a/django/db/models/functions/__init__.py
+++ b/django/db/models/functions/__init__.py
@@ -2,7 +2,6 @@ from .base import (
     Cast, Coalesce, Concat, ConcatPair, Greatest, Least, Length, Lower, Now,
     Substr, Upper,
 )
-
 from .datetime import (
     Extract, ExtractDay, ExtractHour, ExtractMinute, ExtractMonth,
     ExtractSecond, ExtractWeekDay, ExtractYear, Trunc, TruncDate, TruncDay,
diff --git a/django/db/models/functions/datetime.py b/django/db/models/functions/datetime.py
index e6815fbb03..2980460709 100644
--- a/django/db/models/functions/datetime.py
+++ b/django/db/models/functions/datetime.py
@@ -1,4 +1,5 @@
 from __future__ import absolute_import
+
 from datetime import datetime
 
 from django.conf import settings
diff --git a/django/middleware/csrf.py b/django/middleware/csrf.py
index 276b31e10f..7978620ece 100644
--- a/django/middleware/csrf.py
+++ b/django/middleware/csrf.py
@@ -20,7 +20,6 @@ from django.utils.http import is_same_domain
 from django.utils.six.moves import zip
 from django.utils.six.moves.urllib.parse import urlparse
 
-
 logger = logging.getLogger('django.request')
 
 REASON_NO_REFERER = "Referer checking failed - no Referer."