Fix is_none_type

hramezani · hramezani · commit aab48c929cb0 · 2023-05-23T14:44:10.000+03:30
diff --git a/pydantic/typing.py b/pydantic/typing.py
@@ -360,10 +360,7 @@ def is_none_type(type_: Any) -> bool:
 else:
 
     def is_none_type(type_: Any) -> bool:
-        for none_type in NONE_TYPES:
-            if type_ is none_type:
-                return True
-        return False
+        return type_ in NONE_TYPES
 
 
 def display_as_type(v: Type[Any]) -> str:
