While在函数中循环？

Question

我对编码完全陌生，正在使用Python作为一个学校项目开发一个基于文本的游戏。用户必须通过键入“北”、“东”、“南”或“西”进入房间。如果方向无效，则应弹出错误消息，提示用户输入新方向。如果用户键入退出，游戏应该结束。

这个项目有一百万个问题，因为我发现我在编码方面很糟糕，但我想弄清楚的是，如果出现提示，如何让我的程序退出游戏。这是我的代码（它不是完整的代码，只是我到目前为止所拥有的代码。我试图一步一步地解决问题，这是我遇到的问题）：

rooms = {
    'Great Hall': {'South': 'Bedroom'},
    'Bedroom': {'North': 'Great Hall', 'East': 'Cellar'},
    'Cellar': {'West': 'Bedroom'}
}


def main():
    current_room = 'Great Hall'
    user_input = None

    while user_input != "Quit":
        print('You are in the', current_room + '.')
        user_input = input('Where would you like to go?: ')
        current_room = rooms[current_room][user_input]
    else:
        print('Thanks for playing!')


main()

当我运行程序时，我得到这个错误消息：错误消息

如果有人能给我指出我需要解决的问题的正确方向，我将不胜感激！！

Answer 1

您可以使用walrus运算符以获得更简单的代码：

rooms = {
    'Great Hall': {'South': 'Bedroom'},
    'Bedroom': {'North': 'Great Hall', 'East': 'Cellar'},
    'Cellar': {'West': 'Bedroom'}
}

def main():
    current_room = 'Great Hall'

    while user_input:=input('Where would you like to go?: ') != 'Quit':
        print('You are in the ' + current_room + '.')
        current_room = rooms[current_room][user_input]
    print('Thanks for playing!')

main()

Answer 2

试着把它放在if语句中？发生错误是因为它试图在循环回while语句之前找到要移动的正确房间。使用if会立即强制它首先确定退出。

rooms = {
    'Great Hall': {'South': 'Bedroom'},
    'Bedroom': {'North': 'Great Hall', 'East': 'Cellar'},
    'Cellar': {'West': 'Bedroom'}
}


def main():
    current_room = 'Great Hall'
    user_input = None

    while user_input != "Quit":
        print('You are in the', current_room + '.')
        user_input = input('Where would you like to go?: ')
        
        if user_input == "Quit":
            print('Thanks for playing!')
        else:
            current_room = rooms[current_room][user_input]
    

main()

Answer 3

因此，当用户输入“退出”时，您可以在房间中找到它。您应该将退出条件移动到输入之后，而不是成为while条件的一部分：

rooms = {
    'Great Hall': {'South': 'Bedroom'},
    'Bedroom': {'North': 'Great Hall', 'East': 'Cellar'},
    'Cellar': {'West': 'Bedroom'}
}


def main():
    current_room = 'Great Hall'

    while True:
        print('You are in the', current_room + '.')
        user_input = input('Where would you like to go?: ')
        if user_input == "Quit":
            break
        current_room = rooms[current_room][user_input]
    print('Thanks for playing!')

main()