Apparently I was using the wrong ignore code

Author: Matiiss

buildconfig/stubs/pygame/sprite.pyi

@@ -150,7 +150,7 @@ _TDirtySprite = TypeVar("_TDirtySprite", bound=_DirtySpriteSupportsGroup)
 class AbstractGroup(Generic[_TSprite]):
     spritedict: Dict[_TSprite, Optional[Union[FRect, Rect]]]
     lostsprites: List[Union[FRect, Rect]]
-    def __class_getitem__(cls, generic: Any) -> typing._GenericAlias: ...  # type: ignore[attr-defined]
+    def __class_getitem__(cls, generic: Any) -> typing._GenericAlias: ...  # type: ignore[name-defined]
     def __init__(self) -> None: ...
     def __len__(self) -> int: ...
     def __iter__(self) -> Iterator[_TSprite]: ...

src_py/sprite.py

@@ -375,7 +375,7 @@ def __class_getitem__(cls, generic):
         # switch to `types.GenericAlias` once Python 3.8 support is dropped
         import typing
 
-        return typing._GenericAlias(cls, generic)  # type: ignore[attr-defined]
+        return typing._GenericAlias(cls, generic)  # type: ignore[name-defined]
 
     # protected identifier value to identify sprite groups, and avoid infinite recursion
     _spritegroup = True

test/sprite_test.py

@@ -669,7 +669,7 @@ def test_type_subscript(self):
         # switch to `types.GenericAlias` once Python 3.8 support is dropped
         import typing
 
-        self.assertIsInstance(group_generic_alias, typing._GenericAlias)  # type: ignore[attr-defined]
+        self.assertIsInstance(group_generic_alias, typing._GenericAlias)  # type: ignore[name-defined]
         self.assertIs(typing.get_origin(group_generic_alias), sprite.Group)
         self.assertEqual(typing.get_args(group_generic_alias), (sprite.Sprite,))