lint fixup

pandas/core/frame.py

@@ -645,7 +645,7 @@ def _constructor(self) -> Callable[..., DataFrame]:
 
  _constructor_sliced: Callable[..., Series] = Series
 
- def __init_subclass__(cls, /, **kwargs):
+ def __init_subclass__(cls, /, **kwargs) -> None:
  super().__init_subclass__(**kwargs)
  if cls._constructor is not DataFrame._constructor:
  warnings.warn(

pandas/core/series.py

@@ -579,7 +579,7 @@ def _init_dict(
 
  # ----------------------------------------------------------------------
 
- def __init_subclass__(cls, /, **kwargs):
+ def __init_subclass__(cls, /, **kwargs) -> None:
  super().__init_subclass__(**kwargs)
  if cls._constructor is not Series._constructor:
  warnings.warn(