Decorator

import timeit
from typing import Union


def time_it(a):
    def timer(func):
        def setup(*args, **kwargs):
            counter = 0
            for i in range(a):
                t0 = timeit.default_timer()
                func(*args, **kwargs)
                t1 = timeit.default_timer()
                counter += t1 - t0
            print(counter / a)
            return ''

        return setup

    return timer


@time_it(100)
def product(*args: Union[int, float]) -> None:
    s, n = list(args), 1
    for i in range(len(s)):
        n *= args[i]
    print(n)


product(1, 2, 3, 4)