python小程序，编写一个函数，接受list并用reduce求积

from functools import reduce
def prod(L):
    return reduce(lambda x,y:x * y,L)
print('3 * 5 * 7 * 9 =', prod([3, 5, 7, 9]))
if prod([3, 5, 7, 9]) == 945:
    print('测试成功!')
else:
    print('测试失败!')