from typing import List
import math

def product(numbers: list[float]) -> float:

    if not numbers:
        raise ValueError('Die Liste darf nicht leer sein ')
    result= 1.0
    for n in numbers:
        if not isinstance(n, (float, int, str)):
            raise ValueError('Ungültig')
        result *= n
    return result


if __name__ == "__main__":
    print(product([2, 3, 4]))