python 入门练习

import random
import  sys 
#from random import  randint
def guess():
    ubuntu = random.randint(0,2)#随机数
    print(ubuntu)
    print("请输入 剪刀(0) 石头(1) 布(2)")
    player = input("请选择:")
    if int(player) == ubuntu:
        print("赢")
    else:
        print("败")
        again = input("是否重新再来?Y/N")
        if (again=="Y"):
            guess()
        else:
            sys.exit() #退出

guess()