闲着无聊 一个python的，三级菜单。装逼版。

menu = {
    ‘北京‘: {
        ‘海淀‘: {
            ‘五道口‘: {
                ‘soho‘: {},
                ‘网易‘: {},
                ‘google‘: {}
            },
            ‘中关村‘: {
                ‘爱奇艺‘: {},
                ‘汽车之家‘: {},
                ‘youku‘: {},
            },
            ‘上地‘: {
                ‘百度‘: {},
            },
        },
        ‘昌平‘: {
            ‘沙河‘: {
                ‘老男孩‘: {},
                ‘北航‘: {},
            },
            ‘天通苑‘: {},
            ‘回龙观‘: {},
        },
        ‘朝阳‘: {},
        ‘东城‘: {},
    },
    ‘上海‘: {
        ‘闵行‘: {
            "人民广场": {
                ‘炸鸡店‘: {}
            }
        },
        ‘闸北‘: {
            ‘火车站‘: {
                ‘携程‘: {}
            }
        },
        ‘浦东‘: {},
    },
    ‘山东‘: {},
}

last_menu = []
current_menu = menu

while True:
    for key in current_menu:
        print(key)
    choice = input(">:").strip()
    if not choice: continue
    if choice in current_menu:
        last_menu.append(current_menu)
        current_menu = current_menu[choice]
    if choice == "q":
        if last_menu:
            current_menu = last_menu.pop()
        else:
            print("已经是最顶层")
    if choice == "Q":
        current_menu = menu
最多再加个输入错误重新输入。 最多也就这点代码。