#石头剪刀布

import random

#玩家输入

player = 0

while player!='石头' and player!='剪刀' and player!='布':

    player = input('出拳(石头、剪刀、布)：')

    if player=='石头' or player=='剪刀' or player=='布':

        break

    print('请输入正确信息')

if player=='石头':

    player=1

elif player=='剪刀':

    player=2

elif player=='布':

    player=3

#电脑随机

computer=random.randint(1,3)

if computer==1:

    print('computer:石头')

elif computer==2:

    print('computer:剪刀')

elif computer==3:

    print('computer:布')

#比较

if player==computer:

    print('平局')

elif ((player<computer and computer-player==1)

        or(player>computer and computer-player==-2)):

    print('you win')

elif ((player>computer and computer-player==-1)

        or(player<computer and computer-player==2)):

    print('computer win')