diff --git a/django/db/migrations/autodetector.py b/django/db/migrations/autodetector.py
index dd9595bd7e4..5ffa22d8ce2 100644
--- a/django/db/migrations/autodetector.py
+++ b/django/db/migrations/autodetector.py
@@ -716,7 +716,6 @@ class MigrationAutodetector(object):
                             self.renamed_fields[app_label, model_name, field_name] = rem_field_name
                             break
 
-
     def generate_added_fields(self):
         """
         Fields that have been added
diff --git a/tests/model_fields/models.py b/tests/model_fields/models.py
index 177d48f9dac..f53c45c693e 100644
--- a/tests/model_fields/models.py
+++ b/tests/model_fields/models.py
@@ -58,7 +58,7 @@ class Counter(six.Iterator):
             raise StopIteration
         else:
             self.n += 1
-            return (self.n, 'val-'+str(self.n))
+            return (self.n, 'val-' + str(self.n))
 
 
 class WhizIter(models.Model):