老男孩python3学习，课堂作业1.2 多级菜单查询

Posted 2020-10-02

# Version: python3.6
# Author: Gao
# 多级菜单：三级菜单，可依次选择进入子菜单，列表，字典

city_dict = {
             "四川省": {
                      "成都市": ["锦江区", "青羊区", "金牛区", "武侯区", "成华区", "龙泉驿区"],
                      "攀枝花市": ["东区", "西区", "仁和区", "米易县", "盐边县"],
                      "泸州市": ["江阳区", "纳溪区", "龙马潭区", "泸县", "合江县"],
                      "德阳市": ["旌阳区", "中江县", "罗江县", "广汉市", "什邡市"]
                        },
             "河北省": {
                        "石家庄市": ["长安区", "桥东区", "桥西区", "新华区", "井陉矿区"],
                        "唐山市": ["路南区", "路北区", "古冶区", "开平区", "丰南区"]
                        }
            }
city_index = [(index, key) for index, key in enumerate(city_dict)]  # 创建查询索引，enumerate用来遍历数据对象（这里字典表）
city_index.append((len(city_dict), ‘退出‘))                         # 添加退出选项

while True:

    print(‘_______三级城市查询_______‘)
    print(‘__________________________‘)
    for i in city_index:                               # for省份列表(0, ‘四川省‘), (1, ‘河北省‘), (2, ‘退出‘)
        for j in i:                                    # for (0, ‘四川省‘)、xxx、xxx
            print(j, end=‘ ‘)                          # 打印省份
        print(‘ ‘)
    province_num = input("请输入你想查询的省份编号:")
    province = city_index[int(province_num)][1]         # 在city_index 里 按照输入的省份编号进行索引
    if int(province_num) == int(len(city_dict)):        # 选择退出执行
        print("欢迎再次登录，再见！")
        break
    # print(province)
    #print(len(city_dict[province])
    while True:
        c_index = [(index, key) for index, key in enumerate(city_dict[province])]   # 同上原理
        c_index.append((len(c_index), ‘返回‘))
        for i in c_index:
            for j in i:
                print(j, end=‘ ‘)
            print(‘‘)
        c_num = input("请输入你想查询的城市编号:")
        if int(c_num) == int(len(city_dict[province])):
            break
        city = c_index[int(c_num)][1]
        county = list(enumerate(city_dict[province][city]))
        print(county)
        print(‘___________end_____________‘)