python用if语句编写石头剪刀布程序

好的，以下是使用 `if` 语句编写的 Python 石头剪刀布游戏程序：

import random

print("欢迎来到石头剪刀布游戏！")

while True:
    player = input("请出拳（石头/剪刀/布）：")
    player = player.lower()
    while player not in ["石头", "剪刀", "布"]:
        player = input("输入有误，请重新出拳（石头/剪刀/布）：")
        player = player.lower()

    computer = random.choice(["石头", "剪刀", "布"])

    print("你出了 %s，电脑出了 %s。" % (player, computer))

    if player == computer:
        print("平局！")
    elif player == "石头":
        if computer == "剪刀":
            print("恭喜你，你赢了！")
        else:
            print("很遗憾，你输了。")
    elif player == "剪刀":
        if computer == "布":
            print("恭喜你，你赢了！")
        else:
            print("很遗憾，你输了。")
    else:
        if computer == "石头":
            print("恭喜你，你赢了！")
        else:
            print("很遗憾，你输了。")

    play_again = input("再玩一局？（是/否）：")
    play_again = play_again.lower()
    while play_again not in ["是", "否"]:
        play_again = input("输入有误，请重新输入（是/否）：")
        play_again = play_again.lower()

    if play_again == "否":
        break

print("游戏结束，谢谢参与！")

程序逻辑和前面的版本基本一致，只是在判断胜负时使用了嵌套的 `if` 语句。