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：

 

 1 #!/usr/bin/env python
 2 # -*- coding:utf-8 -*-
 3 
 4 
 5 district_maps = {           #定义字典
 6     "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"],},
 7     "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"]},
 8     "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"]},
 9     "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"]},
10     "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"]},
11     "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"]},
12     "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"]},
13     "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"]},
14 }
15 
16 def menu():
17    while True:
18         on = ()
19         c = ()
20         for i in district_maps:
21             print(i)
22         on = input("请输入地区：")
23         while True:
24             if on in district_maps.keys():
25                 for e in district_maps[on]:
26                     print(e)
27                 c = input("请输入省份：")
28                 if c in district_maps[on]:
29                     for d in district_maps[on][c]:
30                         print(d)
31                     while True:
32                         d = input("返回上层请输入b，退出请输入q：")
33                         if d == "b":
34                             break
35                         elif d == "q":
36                             print("谢谢使用")
37                             exit(0)
38                         else:
39                             print("输入错误，请重新输入")
40                 elif c == "b":
41                     break
42                 elif c == "q":
43                     print("谢谢使用")
44                     exit(0)
45                 else:
46                     print("输入有误，请重新输入")
47             elif on == "q":
48                 print("谢谢使用")
49                 exit(0)
50             else:
51                 print("输入有误，请重新输入")
52 if __name__ == '__main__':
53     menu()
三级菜单