from typing import Concatenate def with_request(f: Callable[Concatenate[Request, P], R]) -> Callable[P, R]: def inner(*args: P.args, **kwargs: P.kwargs) -> R: return f(Request(), *args, **kwargs) return inner @with_request def takes_int_str(request: Request, x: int, y: str) -> int: # use request return x + 7 takes_int_str(1, "A") # Accepted takes_int_str("B", 2) # Correctly rejected by the type checker