用Python写剪刀石头布小游戏

#!/usr/bin/env python
#coding:utf8
import random
S="石头"
J="剪刀"
B="布"
allList = [S,J,B]
ManWinList = ([S,J],[J,B],[B,S])
MAN = raw_input("请输入石头、剪刀、布:")
PC = random.choice(allList)
if MAN not in allList:
    print ("出手错误，退出游戏")
    exit()
print ("电脑出了："),PC
if MAN==PC:
    print ("平手！")
elif [MAN,PC] in ManWinList:
    print ("你赢了！")
else:
    print ("你输了！")