diff --git a/graphene/contrib/django/tests/test_types.py b/graphene/contrib/django/tests/test_types.py
index 66be7f3c..0e8eaa11 100644
--- a/graphene/contrib/django/tests/test_types.py
+++ b/graphene/contrib/django/tests/test_types.py
@@ -89,6 +89,7 @@ def test_interface_objecttype_init_unexpected():
         Human(object())
     assert str(excinfo.value) == "Human received a non-compatible instance (object) when expecting Article"
 
+
 def test_object_type():
     object_type = schema.T(Human)
     Human._meta.fields_map
diff --git a/graphene/core/types/field.py b/graphene/core/types/field.py
index 58700ad3..53187391 100644
--- a/graphene/core/types/field.py
+++ b/graphene/core/types/field.py
@@ -79,6 +79,7 @@ class Field(OrderedType):
             resolver = getattr(type_objecttype, 'mutate')
         else:
             my_resolver = resolver
+
             @wraps(my_resolver)
             def wrapped_func(instance, args, info):
                 if not isinstance(instance, self.object_type):