python之三级菜单

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()

三级菜单