判断水仙花数

while 1 :
    number = input("请输入一个三位数：")
    sum = 0
    if number.isdigit():
        for i in number:
            sum = sum + int(i)**3
        if sum == int(number):
            print("这是一个水仙花数")
        else:
            print("这不是一个水仙花数")
    elif number.upper() == "Q":
        break
    else:
        print("请输入一个三位数！")