from typing import ParamSpec, TypeVar, Callable
from functools import wraps

P = ParamSpec('P')
R = TypeVar('R')

def log(f: Callable[P, R]) -> Callable[P, R]:
    @wraps(f)
    def w(*a: P.args, **k: P.kwargs) -> R:
        return f(*a, **k)
    return w