python之三级菜单

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python之三级菜单

要求：

1. 运行程序输出第一级菜单

2. 选择一级菜单某项，输出二级菜单，同理输出三级菜单

3. 菜单数据保存在文件中

4. 让用户选择是否要退出

5. 有返回上一级菜单的功能

流程图：

代码：

 #!/usr/bin/env python

 # -*- coding:utf-8 -*-

 district_maps = {           #定义字典

     "华东区":{"山东":["济南","青岛","淄博"],"江苏":["苏州","南京","无锡"],"浙江":["杭州","宁波","温州"],},

     "华南区":{"广东":["广州","深圳","珠海"],"广西":["桂林","柳州","北海"],"海南":["三亚","海口","三沙"]},

     "华中区":{"湖北":["武汉","宜昌","黄冈"],"湖南":["长沙","株洲","湘潭"],"江西":["南昌","九江","上饶"]},

     "华北区":{"北京":["东城区","朝阳区","海淀区"],"天津":["和平区","河西区","河北区"],"河北":["石家庄","唐山","张家口"]},

     "西北区":{"宁夏":["银川","吴忠","固原"],"青海":["西宁","海东","海北藏族自治州"],"陕西":["西安","咸阳","延安"]},

     "西南区":{"四川":["成都","绵阳","广元"],"云南":["昆明","丽江","玉溪"],"贵州":["贵阳","安顺","铜仁"]},

     "东北区":{"辽宁":["沈阳","大连","鞍山"],"吉林":["长春","吉林","辽源"],"黑龙江":["哈尔滨","齐齐哈尔","牡丹江"]},

     "港澳台区":{"香港":["香港岛","九龙半岛","新界"],"澳门":["澳门半岛","离岛","路氹城"],"台湾":["台北","台中","台南"]},

 }

 def menu():

    while True:

         on = ()

         c = ()

         for i in district_maps:

             print(i)

         on = input("请输入地区：")

         while True:

             if on in district_maps.keys():

                 for e in district_maps[on]:

                     print(e)

                 c = input("请输入省份：")

                 if c in district_maps[on]:

                     for d in district_maps[on][c]:

                         print(d)

                     while True:

                         d = input("返回上层请输入b，退出请输入q：")

                         if d == "b":

                             break

                         elif d == "q":

                             print("谢谢使用")

                             exit(0)

                         else:

                             print("输入错误，请重新输入")

                 elif c == "b":

                     break

                 elif c == "q":

                     print("谢谢使用")

                     exit(0)

                 else:

                     print("输入有误，请重新输入")

             elif on == "q":

                 print("谢谢使用")

                 exit(0)

             else:

                 print("输入有误，请重新输入")

 if __name__ == '__main__':

     menu()