为何Python龙文本游戏无法实现房间移动与退出功能？

问题概述 #

开发的Python龙文本游戏预期实现房间间移动、随时退出功能，但实际运行时，输入方向指令（如south）或exit均提示无效操作，无法切换房间或退出，游戏陷入循环。

问题代码 #

def show_instructions():
    if __name__ == "__main__":
        while True:
            print('Dragon Text Game\n')


print('\t\t\tDragon Text Game.')
print('--------------------------------------------------------------------------------------- ------')
print('Move commands: South, North, East, West')
print('Type "Exit" to end the game.')
print("Let's start with your name:  ")

name = input()
print(f'Good luck, {name}!')

# 简化版龙文本游戏的房间字典，关联房间之间的连接关系
rooms = {
         'Great Hall': {'name': 'Great Hall', 'South': 'Bedroom',
         'text': 'You are in the Great Hall.'},
         'Bedroom': {'name': 'Bedroom', 'North': 'Great Hall', 'East': 'Cellar',
         'text': 'You are in the Bedroom.'},
         'Cellar': {'name': 'Cellar', 'West': 'Bedroom',
         'text': 'You are in the Cellar. Type "Exit" to end the game!'}
         }


directions = ['North', 'South', 'East', 'West']
current_room = rooms['Great Hall']
exit = False

# 游戏主循环
while True:
    print(current_room['text'])
    command = input('\nEnter your move: ')
    if command == 'Exit':
        if current_room['name'] == 'Cellar':
            # 进入地窖则游戏完成
            print('Congratulations !!')
            print("You've completed 'Dragon Text Game'.")
        print('Thanks for playing!')
        break
    if command in directions:
        if command in current_room:
            current_room = rooms[current_room[command]]
        else:
            print(f'No door in {command} direction!')
    else:
        print('Invalid move!')

运行输出 #

Dragon Text Game.
--------------------------------------------------------------------------------------- ------
Move commands: South, North, East, West
Type "Exit" to end the game.
Let's start with your name:  
Reb
Good luck, Reb!
You are in the Great Hall.

Enter your move: south
Invalid move!
You are in the Great Hall.

Enter your move: east
Invalid move!
You are in the Great Hall.

Enter your move: exit
Invalid move!
You are in the Great Hall.

问题原因 #

1. 大小写不匹配：
   • 代码中退出判断条件为command == 'Exit'，但用户输入的是小写exit，两者不匹配，无法触发退出逻辑。
   • 方向列表directions中的元素是首字母大写格式（如'South'），但用户输入的是小写south，导致command in directions判断不成立，无法触发房间移动逻辑。
2. 缩进错误：原代码中else语句的缩进与对应if不匹配（多一层缩进），导致语法逻辑错误，即使输入符合条件的命令也无法正确执行。

修复方案 #

方案1：统一命令为为首字母大写（推荐） #

将用户输入的命令转换为首字母大写格式，消除大小写差异，同时修正缩进：

# 游戏主循环
while True:
    print(current_room['text'])
    # 去除输入首尾空格并转换为首字母大写
    command = input('\nEnter your move: ').strip().capitalize()
    if command == 'Exit':
        if current_room['name'] == 'Cellar':
            print('Congratulations !!')
            print("You've completed 'Dragon Text Game'.")
        print('Thanks for playing!')
        break
    if command in directions:
        if command in current_room:
            current_room = rooms[current_room[command]]
        else:
            print(f'No door in {command} direction!')
    else:
        print('Invalid move!')

方案2：支持任意大小写输入 #

如果希望兼容用户任意大小写的输入习惯，可以将命令和判断条件统一转为小写：

# 游戏主循环
while True:
    print(current_room['text'])
    # 去除输入首尾空格并转换为小写
    command = input('\nEnter your move: ').strip().lower()
    if command == 'exit':
        if current_room['name'] == 'Cellar':
            print('Congratulations !!')
            print("You've completed 'Dragon Text Game'.")
        print('Thanks for playing!')
        break
    # 将方向列表转为小写后匹配
    if command in [d.lower() for d in directions]:
        # 找到对应的原方向（首字母大写）
        direction = next(d for d in directions if d.lower() == command)
        if direction in current_room:
            current_room = rooms[current_room[direction]]
        else:
            print(f'No door in {direction} direction!')
    else:
        print('Invalid move!')

内容的提问来源于stack exchange，提问作者Rebisnotagoodcoder