2021-11-05简单的剪刀石头布，python

一个三局两胜制的猜拳游戏

import random
win=0
lose=0
b=0
a=0
while win<2 and lose <2:
    str = input("请输入：");
    if str=="剪刀":
        b=1
    elif str=="石头":
        b=2
    elif str=="布":
        b=3

    a=random.randint(1, 3)
    print("电脑出的是")
    if a==1:
         print("剪刀")
    if a ==2:
        print("石头")
    if a==3:
        print("布")

    if a==b:
        print("平局")
    elif b==1 and a==3 or b==2 and a==1 or b==3 and a==2:
        print("赢！")
        win=win+1
    else:
        print("输！")
        lose = lose + 1
if win==2:
    print("你赢了！")
else:
    print("你输了！")