class RemoteFunction(Generic[_T]): def __init__(self, return_type: type[_T] | Callable[[Any], _T]): self._return_type = return_type def _validate(self, response: Any) -> _T: if isinstance(self._return_type, type): reveal_type(self._return_type) # Revealed type is "builtins.type" Mypy # Type of "self._return_type" is "type[object] | type" Pylance if not isinstance(response, self._return_type): raise TypeError reveal_type(response) # Revealed type is "builtins.object"Mypy # Type of "response" is "Any" Pylance return response # Incompatible return value type (got "object", expected "_T") return self._return_type(response) def __call__(self) -> _T: remote_response: Any = None # actually from network/db/etc return self._validate(remote_response) # Usage example my_remote_func = RemoteFunction(int) response = my_remote_func() reveal_type(response) # Type of "response" is "int" Pylance # Revealed type is "builtins.int" Mypy