diff --git a/polymorphic/admin/childadmin.py b/polymorphic/admin/childadmin.py
index 0d45f88..5702f43 100644
--- a/polymorphic/admin/childadmin.py
+++ b/polymorphic/admin/childadmin.py
@@ -167,7 +167,6 @@ class PolymorphicChildModelAdmin(admin.ModelAdmin):
             context.update(extra_context)
         return super(PolymorphicChildModelAdmin, self).history_view(request, object_id, extra_context=context)
 
-
     # ---- Extra: improving the form/fieldset default display ----
 
     def get_fieldsets(self, request, obj=None):
diff --git a/polymorphic/formsets/generic.py b/polymorphic/formsets/generic.py
index 2109d82..da0359d 100644
--- a/polymorphic/formsets/generic.py
+++ b/polymorphic/formsets/generic.py
@@ -11,6 +11,7 @@ class GenericPolymorphicFormSetChild(PolymorphicFormSetChild):
     """
     Formset child for generic inlines
     """
+
     def __init__(self, *args, **kwargs):
         self.ct_field = kwargs.pop('ct_field', 'content_type')
         self.fk_field = kwargs.pop('fk_field', 'object_id')
diff --git a/polymorphic/formsets/utils.py b/polymorphic/formsets/utils.py
index 589a3e2..3d55f8b 100644
--- a/polymorphic/formsets/utils.py
+++ b/polymorphic/formsets/utils.py
@@ -2,6 +2,7 @@
 Internal utils
 """
 
+
 def add_media(dest, media):
     """
     Optimized version of django.forms.Media.__add__() that doesn't create new objects.
diff --git a/polymorphic/query.py b/polymorphic/query.py
index ace48c2..f8aeb94 100644
--- a/polymorphic/query.py
+++ b/polymorphic/query.py
@@ -472,4 +472,3 @@ class PolymorphicQuerySet(QuerySet):
             return olist
         clist = PolymorphicQuerySet._p_list_class(olist)
         return clist
-
diff --git a/polymorphic/query_translate.py b/polymorphic/query_translate.py
index ba26a9f..5f6b436 100644
--- a/polymorphic/query_translate.py
+++ b/polymorphic/query_translate.py
@@ -110,7 +110,6 @@ def translate_polymorphic_filter_definitions_in_args(queryset_model, args, using
     return [translate_polymorphic_Q_object(queryset_model, q, using=using) for q in q_objects]
 
 
-
 def _translate_polymorphic_filter_definition(queryset_model, field_path, field_val, using=DEFAULT_DB_ALIAS):
     """
     Translate a keyword argument (field_path=field_val), as used for
@@ -271,4 +270,3 @@ def _create_model_filter_Q(modellist, not_instance_of=False, using=DEFAULT_DB_AL
     if not_instance_of:
         q_ored = ~q_ored
     return q_ored
-
diff --git a/polymorphic/tests.py b/polymorphic/tests.py
index 9c2cb3d..d8b936e 100644
--- a/polymorphic/tests.py
+++ b/polymorphic/tests.py
@@ -432,6 +432,7 @@ class PolymorphicTests(TestCase):
     """
     The test suite
     """
+
     def test_annotate_aggregate_order(self):
         # create a blog of type BlogA
         # create two blog entries in BlogA
@@ -630,7 +631,6 @@ class PolymorphicTests(TestCase):
         self.assertEqual(repr(objects_only_field4[3]),
                          '<Model2D: id 4, field1 (CharField), field2 (CharField), field3 (CharField), field4 (CharField), deferred[field4]>')
 
-
     def test_manual_get_real_instance(self):
         self.create_model2abcd()
 
@@ -1161,7 +1161,7 @@ class PolymorphicTests(TestCase):
             lambda: Model2A.objects.aggregate(Count('Model2B___field2'))
         )
 
-    @skipIf(django.VERSION < (1,8,), "This test needs Django >=1.8")
+    @skipIf(django.VERSION < (1, 8,), "This test needs Django >=1.8")
     def test_polymorphic__complex_aggregate(self):
         """ test (complex expression on) aggregate (should work for annotate either) """
 
@@ -1180,14 +1180,14 @@ class PolymorphicTests(TestCase):
         # we have to set the defaul alias or django won't except a complex expression
         # on aggregate/annotate
         def ComplexAgg(expression):
-            complexagg = Count(expression)*10
+            complexagg = Count(expression) * 10
             complexagg.default_alias = 'complexagg'
             return complexagg
 
         with self.assertRaisesMessage(AssertionError, 'PolymorphicModel: annotate()/aggregate(): ___ model lookup supported for keyword arguments only'):
             Model2A.objects.aggregate(ComplexAgg('Model2B___field2'))
 
-    @skipIf(django.VERSION < (1,8,), "This test needs Django >=1.8")
+    @skipIf(django.VERSION < (1, 8,), "This test needs Django >=1.8")
     def test_polymorphic__expressions(self):
 
         from django.db.models.functions import Concat
@@ -1239,7 +1239,7 @@ class RegressionTests(TestCase):
 class MultipleDatabasesTests(TestCase):
     multi_db = True
 
-    @skipIf(django.VERSION < (1,5,), "This test needs Django >=1.5")
+    @skipIf(django.VERSION < (1, 5,), "This test needs Django >=1.5")
     def test_save_to_non_default_database(self):
         Model2A.objects.db_manager('secondary').create(field1='A1')
         Model2C(field1='C1', field2='C2', field3='C3').save(using='secondary')