多级菜单的前进与后退

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‘: {
            ‘火车战‘: {
                ‘携程‘: {}
            }
        },
        ‘浦东‘: {},
    },
    ‘山东‘: {},
}
def get_menu(menu):
    ret=True
    while ret:
        for i in menu.keys():
            print(i)
        flag=True
        while flag:
            key = input(‘>>>‘)
            if menu.get(key):
                dic=menu[key]
                ret=get_menu(dic)
                flag=False
            elif key.upper()==‘B‘:
                flag = False
                return True
            elif key.upper()==‘Q‘:
                print("程序结束")
                flag = False
                return False
            else:
                print(‘再次输入‘)
                continue
get_menu(menu)

多级菜单的前进与后退

原文：https://www.cnblogs.com/diracy/p/13338976.html