在Python 3中转到 [英] Go to in Python 3

问题描述

Python 3没有GOTO或类似的东西.但是我有一些算法，需要GOTO类型的功能. 可能有人可以建议出路吗?

Python 3 have no GOTO or something like this. But I have some algoritm, that need GOTO type functionality. May be someone can suggest way out?

主菜单

1-新游戏 2选项 3退出

1-New Game 2-Options 3-Exit

用户操作-进入主菜单-进入选项菜单-再次进入主菜单，依此类推.因此，在代码中，我不知道如何通过主菜单返回并传送到上层代码.

User actions - enter to main menu - enter to options menu - enter to main menu AGAIN and so on. So in code I don't know how turn back and teleport to upper code with main menu.

推荐答案

您可以使用字典:'用户选择'->'相应操作'，例如:

You could use a dictionary: 'user choice' -> 'corresponding action' e.g.:

import sys

def foo():
    print('foo')

actions = {'1': foo, '2': sys.exit}

def read_choice(choices, prompt):
    c = None
    while c not in choices:
        c = input(prompt)
    return c

while True:
    # get user input
    x = read_choice(actions, 'Input 1 to do foo or 2 to exit')
    actions[x]() # act on it

请参见完整示例，该示例还显示了如何从配置文件动态创建菜单.

See complete example that also shows how to create menu dynamically from a configuration file.

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