Fixed some newlines in imports per isort.

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,

django/db/models/functions/datetime.py

@@ -1,4 +1,5 @@
 from __future__ import absolute_import
+
 from datetime import datetime
 
 from django.conf import settings

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."