diff --git a/rest_framework/fields.py b/rest_framework/fields.py
index e185774a2..9c034da95 100644
--- a/rest_framework/fields.py
+++ b/rest_framework/fields.py
@@ -25,7 +25,9 @@ from django.utils.dateparse import (
 )
 from django.utils.duration import duration_string
 from django.utils.encoding import is_protected_type, smart_text
-from django.utils.formats import localize_input, sanitize_separators, number_format
+from django.utils.formats import (
+    localize_input, number_format, sanitize_separators
+)
 from django.utils.functional import cached_property
 from django.utils.ipv6 import clean_ipv6_address
 from django.utils.translation import ugettext_lazy as _