import random

punches = ['石头','剪刀','布']

computer_choice = random.choice(punches)

user_choice = input('请出拳：（石头、剪刀、布）')  # 请用户输入选择

while user_choice not in punches:  # 当用户输入错误，提示错误，重新输入

    print('输入有误，请重新出拳')

    user_choice = input()

# 亮拳

print('————战斗过程————')

print('电脑出了：%s' %(computer_choice))

print('你出了：%s' %(user_choice))

# 胜负

print('—————结果—————')

if user_choice == computer_choice:  # 使用if进行条件判断

    print('平局！')

elif (user_choice == '石头' and computer_choice == '剪刀') or (user_choice == '剪刀' and computer_choice == '布') or (user_choice == '布' and computer_choice == '石头'):

    print('你赢了！')

else:

    print('你输了！')

elif user_choice == punches[punches.index(computer_choice)-1]: