Python学习第二天-编写三级菜单

编写三级菜单：
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

 1 # Author: zfh
 2 
 3 data = {
 4     "陕西":{
 5         "汉中":["张骞故里","古汉台"],
 6         "西安":[],
 7         "商洛":[]
 8     },
 9     "山西":{
10         "太远":[],
11         "运城":[],
12         "平凉":[]
13     },
14     "山东":{
15         "青岛":[],
16         "济南":[],
17         "聊城":[]
18     }
19 }
20 exit_flag = False
21 while not exit_flag:
22     for i in data:
23         print(i)
24     choice = input("请输入选择1>>:")
25     if choice in data:
26         while not exit_flag:
27             for i1 in data[choice]:
28                 print("	",i1)
29             choice1 = input("请输入选择2>>:")
30             if choice1 in data[choice]:
31                 while not exit_flag:
32                     for i2 in data[choice][choice1]:
33                         print("		",i2)
34                     choice2 = input("最后一层，按b返回>>:")
35                     if choice2 == "b":
36                         pass
37                     elif choice2 == "q":
38                         exit_flag = True
39             if choice1 == "b":
40                 break
41             elif choice1 == "q":
42                 exit_flag = True
43     if choice == "b":
44         break
45     elif choice =="q":
46         exit_flag = True