diff --git a/graphene/types/base.py b/graphene/types/base.py
index 2d6a809d..f43feb47 100644
--- a/graphene/types/base.py
+++ b/graphene/types/base.py
@@ -34,7 +34,9 @@ class BaseType(SubclassWithMeta):
         return type(class_name, (cls,), {"Meta": options})
 
     @classmethod
-    def __init_subclass_with_meta__(cls, name=None, description=None, _meta=None, **_kwargs):
+    def __init_subclass_with_meta__(
+        cls, name=None, description=None, _meta=None, **_kwargs
+    ):
         assert "_meta" not in cls.__dict__, "Can't assign directly meta"
         if not _meta:
             return
diff --git a/tests_py36/test_objecttype.py b/tests_py36/test_objecttype.py
index e4530469..bce38d94 100644
--- a/tests_py36/test_objecttype.py
+++ b/tests_py36/test_objecttype.py
@@ -4,12 +4,12 @@ from graphene import Schema, ObjectType, String
 def test_objecttype_meta_with_annotations():
     class Query(ObjectType):
         class Meta:
-            name: str = 'oops'
+            name: str = "oops"
 
         hello = String()
 
         def resolve_hello(self, info):
-            return 'Hello'
+            return "Hello"
 
     schema = Schema(query=Query)
     assert schema is not None