Python房间移动功能报错：多出口房间无法正常跳转求助

我尝试用字典实现房间间的移动，单个出口的房间能正常导航，但存在多个出口的房间会触发错误。

原实现代码 #

# The dictionary links a room to other rooms.
rooms = {
    'Great Hall': {'South': 'Bedroom'},
    'Bedroom': {'North': 'Great Hall', 'East': 'Cellar'},
    'Cellar': {'West': 'Bedroom'}
}


def instructions():
    print("Milestone for Module 6.")
    print("Type 'go' and then the direction want to move in lowercase")
    print("You can type exit to leave the game after this menu")

current_room = 'Great Hall'
direction = ''

while True:
    print('\nYou are in:', current_room)

    direction = input('Move which direction?')
    print('You entered:', direction)

    if direction == 'quit':
        print('Game Exited')
        break

    elif direction == 'go north':
        if 'North' in rooms[current_room].keys():
            current_room = str(*rooms[current_room].values())
        else:
            print('Unable to move to that location, try again.')

    elif direction == 'go south':
        if 'South' in rooms[current_room].keys():
            current_room = str(*rooms[current_room].values())
        else:
            print('Unable to move to that location, try again.')

    elif direction == 'go east':
        if 'East' in rooms[current_room].keys():
            current_room = str(*rooms[current_room].values())
        else:
            print('Unable to move to that location, try again.')

    elif direction == 'go west':
        if 'West' in rooms[current_room].keys():
            current_room = str(*rooms[current_room].values())
        else:
            print('Unable to move to that location, try again.')
    else:
        print('Invalid, please try again.')

报错信息 #

Traceback (most recent call last):
  line 40, in <module>
    current_room = str(*rooms[current_room].values())
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: decoding str is not supported

错误原因 #

问题出在current_room = str(*rooms[current_room].values())这行代码：

• 当房间只有一个出口时，rooms[current_room].values()返回单个值的视图，解包后传给str()不会报错，但这是巧合；
• 当房间有多个出口时，values()返回多个值，用*解包后str()会接收到多个参数，而str()仅支持单个位置参数，因此触发TypeError。

修复后的代码 #

# The dictionary links a room to other rooms.
rooms = {
    'Great Hall': {'South': 'Bedroom'},
    'Bedroom': {'North': 'Great Hall', 'East': 'Cellar'},
    'Cellar': {'West': 'Bedroom'}
}


def instructions():
    print("Milestone for Module 6.")
    print("Type 'go' and then the direction want to move in lowercase")
    print("You can type exit to leave the game after this menu")

current_room = 'Great Hall'
direction = ''

while True:
    print('\nYou are in:', current_room)

    direction = input('Move which direction?')
    print('You entered:', direction)

    if direction == 'quit':
        print('Game Exited')
        break

    elif direction == 'go north':
        if 'North' in rooms[current_room]:
            current_room = rooms[current_room]['North']
        else:
            print('Unable to move to that location, try again.')

    elif direction == 'go south':
        if 'South' in rooms[current_room]:
            current_room = rooms[current_room]['South']
        else:
            print('Unable to move to that location, try again.')

    elif direction == 'go east':
        if 'East' in rooms[current_room]:
            current_room = rooms[current_room]['East']
        else:
            print('Unable to move to that location, try again.')

    elif direction == 'go west':
        if 'West' in rooms[current_room]:
            current_room = rooms[current_room]['West']
        else:
            print('Unable to move to that location, try again.')
    else:
        print('Invalid, please try again.')

关键修改说明 #

• 移除了错误的str(*rooms[current_room].values())写法，改为根据用户输入的方向，直接从当前房间的字典中取出对应的目标房间（比如rooms[current_room]['North']）；
• 简化了存在性判断：'North' in rooms[current_room]等价于'North' in rooms[current_room].keys()，代码更简洁。

内容的提问来源于stack exchange，提问作者midokite