Python 练习：三级菜单选择城市

info = {

    'GuangDong':{

        'GuangZhou': ['TianHe', 'HaiZhu'],

        'MaoMing': ['MaoNan', 'DianBai']},

    'ShanDong': {

        'JiNan': ['ShiZhong', 'LiXia'],

        'QingDao': ['ShiNan', 'ShiBei']

    },

    'GuangXi': {

        'NanNin': ['WuNing', 'LongAn'],

        'GuiLing': ['YangSuo', 'QuanZhou']

    }

}

flag = True

while flag:

    print(''.center(50, '#'))

    for p in info.keys():

        print("省份:", p)

    province = input("Please input the province: [e : exit]")

    if province == 'e':

        break

    if (province in list(info.keys())) == False:

        print("You need to input right province!")

        continue

    while True:

        print(''.center(50, '#'))

        for c in info[province].keys():

            print("城市: ", c)

        city = input("Please input the city: [q: return; e: exit]")

        if city == 'q':

            break

        if city == 'e':

            flag = False

            break

        if (city in list(info[province].keys())) == False:

            print("You need to input right city!")

            continue

        for k in info[province][city]:

            print("区县: ", k)

运行结果：