Python石头剪刀布游戏平局判定失效问题求助

问题说明 #

编程新手第一天编写Python石头剪刀布游戏时遇到问题：当玩家与电脑选择相同时，未按预期触发平局判定，无法得到平局结果。以下是原代码：

import random


def get_choices():
    player_choice = (input('Enter a choice (Rock , Paper , Scissors)'))
    c_choices = ['Rock', 'Paper', 'Scissors']
    computer_choice = random.choice(c_choices)
    choices = {'player': player_choice, 'computer': computer_choice}
    return choices


def check_win(player,computer):
    print(f"You chose {player},computer chose {computer}")
    if player == computer:
        return "its a tie!"
    elif player== 'rock':
        if computer=='scissors':
            return "ROCK SMASHES SCISSORS!, YOU WIN!"
        else:
            return "PAPER COVERS ROCK!, YOU LOSE!"

    elif player== 'paper':
        if computer=='rock':
            return "PAPER COVERS ROCK, YOU WIN!"
        else:
            return "SCISSOR CUTS PAPER!, YOU LOSE!"

    elif player == 'scissors':
        if computer == 'paper':
            return "SCISSORS CUTS PAPER!, YOU WIN!"
        else:
            return "ROCK SMASHES SCISSORS!, YOU LOSE!"

choices = get_choices()
result = check_win(choices['player'], choices['computer'])
print(result)

问题根源 #

核心问题是大小写不匹配：

• 电脑的选择是首字母大写格式（如'Rock'）
• 玩家输入通常是小写（如'rock'），或者大小写和电脑的不一致，导致player == computer的判断永远不成立，自然触发不了平局逻辑。
• 另外，玩家输入时可能不小心加了空格（比如' Rock '），也会导致匹配失败。

解决方案 #

1. 统一大小写格式 #

将玩家输入和电脑的选择都转换成相同的大小写（比如全小写或全大写），消除大小写差异的影响。

2. 清理输入空格 #

对玩家输入做去空格处理，避免因意外空格导致匹配失败。

修改后的代码示例 #

import random


def get_choices():
    # 处理玩家输入：转小写+去首尾空格
    player_choice = input('Enter a choice (Rock, Paper, Scissors): ').strip().lower()
    c_choices = ['rock', 'paper', 'scissors']  # 统一用小写
    computer_choice = random.choice(c_choices)
    choices = {'player': player_choice, 'computer': computer_choice}
    return choices


def check_win(player, computer):
    print(f"You chose {player}, computer chose {computer}")
    if player == computer:
        return "It's a tie!"
    elif player == 'rock':
        return "ROCK SMASHES SCISSORS!, YOU WIN!" if computer == 'scissors' else "PAPER COVERS ROCK!, YOU LOSE!"
    elif player == 'paper':
        return "PAPER COVERS ROCK, YOU WIN!" if computer == 'rock' else "SCISSORS CUT PAPER!, YOU LOSE!"
    elif player == 'scissors':
        return "SCISSORS CUT PAPER!, YOU WIN!" if computer == 'paper' else "ROCK SMASHES SCISSORS!, YOU LOSE!"

choices = get_choices()
result = check_win(choices['player'], choices['computer'])
print(result)

内容的提问来源于stack exchange，提问作者Om Singh