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：