Python文本游戏房间移动指令大小写输入报错调试问题

课程作业开发的文本冒险游戏基础版本，常规运行无异常，调试时输入大小写混合（如GO WEst）、全大写格式的移动指令会触发报错，同时存在其他同类输入触发的报错场景，暂未掌握调试器排查方法。

附原始实现代码：

# The dictionary links a room to other rooms.
# saving for items = {} inventory for next step.
Rooms = {
    'Upper Room1': {'west': 'Upstairs'},
    'Upstairs': {'south': 'The Counter', 'east': 'Upper Room1'},
    'Side Room': {'east': 'The Counter'},
    'The Counter': {'south': 'Backroom', 'west': 'Side Room', 'east': 'Storage Room', 'north': 'Upstairs'},
    'Storage Room': {'west': 'The Counter', 'north': 'Hidden Storage',},
    'Hidden Storage': {'south': 'Storage Room'},
    'Backroom': {'north': 'The Counter', 'east': 'The Villain'},
    'The Villain': {'west': 'Bedroom'}
}
# Start the player in the first room
currentRoom = 'The Counter'

print('Welcome to the Drink Quest!') # Welcomes player to the game
print("Move commands: go North, go East, go West, go South, exit") # Informs the player of the commands of the game
# loop forever
while True:
    if currentRoom.lower() == 'exit':
        break

    # print current status
    print(' ---------------------------')
    print('You are in ' + currentRoom)

    # get action from user
    print("Where do you want to go? ")
    navigate = input('>')

    navigate = navigate.split()

    # Navigation
    if navigate[0].lower() == 'go':
        if navigate[1].lower() in Rooms[currentRoom]:
            currentRoom = Rooms[currentRoom][navigate[1]]
        else:
            print('You can\'t go that way!')
    elif navigate[0].lower() == 'exit':
        currentRoom = 'exit'
    else:
        print("Invalid Choice choose a different path!")
print("Thanks for playing Drink Quest!!")

一共两个核心问题，覆盖所有提到的报错场景：

• 大小写处理逻辑不一致：判断方向是否合法时，代码对输入的方向做了.lower()转小写，去匹配全是小写key的房间出口字典，但实际取对应房间时，用的是未转小写的原始输入值作为key。比如输入GO WEst，判断时'WEst'.lower() == 'west'能匹配到出口，但取值时用'WEst'查字典，字典中不存在这个key，直接触发KeyError。
• 缺失输入长度校验：代码默认用户输入一定符合格式，直接取navigate[0]、navigate[1]，如果用户输入空内容、只输入go不跟方向，split()得到的列表长度不足，会直接触发IndexError，对应提到的其他同类报错。

1. 拿到用户输入拆分后，先做非空、长度校验，不符合格式直接提示无效，避免索引越界
2. 对指令、方向参数统一做小写归一化，杜绝半处理的逻辑漏洞

修复后的核心逻辑参考：

while True:
    if currentRoom.lower() == 'exit':
        break

    print(' ---------------------------')
    print('You are in ' + currentRoom)
    print("Where do you want to go? ")
    raw_input = input('>').strip()
    # 处理空输入
    if not raw_input:
        print("Invalid input, please enter valid command!")
        continue
    navigate = raw_input.split()
    # 统一把指令转小写
    cmd = navigate[0].lower()

    if cmd == 'go':
        # 校验go指令后是否携带方向参数
        if len(navigate) < 2:
            print("Please specify direction after 'go'!")
            continue
        # 统一把方向转小写
        direction = navigate[1].lower()
        if direction in Rooms[currentRoom]:
            currentRoom = Rooms[currentRoom][direction]
        else:
            print('You can\'t go that way!')
    elif cmd == 'exit':
        currentRoom = 'exit'
    else:
        print("Invalid Choice choose a different path!")

替换原循环内的导航逻辑即可，修复后无论输入是大小写混合、全大写、全小写的指令，还是空输入、不完整指令，都不会触发运行报错。

内容的提问来源于stack exchange，提问作者HYBRDF1R3 _