def product(*args):    if len(args) == 0:        raise TypeError('参数不能为空,否则没有意义!')    s = 1    for i in args:        s = s * i    return sprint('product(5) =', product(5))print('product(5, 6) =', product(5, 6))print('product(5, 6, 7) =', product(5, 6, 7))print('product(5, 6, 7, 9) =', product(5, 6, 7, 9))# print(product())