A functional programming approach to fizzbuzz in python

fizzbuzz.py

from typing import Callable


def is_multiple(x: int, num: int) -> bool:
    return x % num == 0


def in_number(x: int, num: int) -> bool:
    return str(num) in str(x)


def fizz_buzz(i: int, fn: Callable[[int, int], bool]) -> str:
    fizz = "Fizz" if fn(i, 3) else ""
    buzz = "Buzz" if fn(i, 5) else ""

    fizzbuzz = fizz + buzz

    return fizzbuzz if fizzbuzz else str(i)


if __name__ == "__main__":

    tdata1 = [1, 2, 3, 4, 5]

    assert [fizz_buzz(i, is_multiple) for i in tdata1] == [
        "1",
        "2",
        "Fizz",
        "4",
        "Buzz",
    ]

    tdata2 = [15, 30, 35, 36, 40]

    assert [fizz_buzz(i, is_multiple) for i in tdata2] == [
        "FizzBuzz",
        "FizzBuzz",
        "Buzz",
        "Fizz",
        "Buzz",
    ]

    print("FizzBuzz Output")
    for i in range(1, 101):
        print(fizz_buzz(i, is_multiple), end=", ")

    #  Extra Credit

    tdata3 = [13, 2, 15, 4, 50]

    assert [fizz_buzz(i, in_number) for i in tdata3] == [
        "Fizz",
        "2",
        "Buzz",
        "4",
        "Buzz",
    ]

    tdata4 = [31, 30, 35, 36, 40]

    assert [fizz_buzz(i, in_number) for i in tdata4] == [
        "Fizz",
        "Fizz",
        "FizzBuzz",
        "Fizz",
        "40",
    ]

    print("\n\nExtra Credit")
    for i in range(1, 101):
        print(fizz_buzz(i, in_number), end=", ")