2.py

def add_number(num, f=True, lnums=[]):
    if f:
        lnums.append(num)
    return lnums


def get_prod():
    lnums = add_number(0, f=False)
    mult = 1
    for num in lnums:
        mult *= num
    return " * ".join(map(str, lnums)) + f" = {mult}"