三级菜单（python3.x）

 1 manue_dic={
 2     "西安":{
 3         "长安区":{
 4             "西安邮电大学":[‘图书馆‘,‘美广‘],
 5             "陕西师范大学":[‘图书馆‘,‘万科‘],
 6                },
 7         "高新区":{
 8             "化为西研所":[‘运维工程师‘,‘java后台开发‘],
 9             "阿里巴巴":[‘云计算运维工程师‘,‘测试开发工程师‘]
10         },
11         "雁塔区":{
12             "小寨":[‘购物商城‘,‘赛格‘],
13             "老校区":[‘邮电‘,‘师大‘]
14         }
15     },
16     "铜川":{
17         "耀州区":{
18             "耀中中学":["学生","老师"],
19             "药王山":["药王庙","游客"]
20         },
21         "新区":{
22             "市一中":["学生","老师"],
23             "阳光广场":["表演","观看表演的人"],
24         },
25         "老区":{
26             "局一中":["学生","老师"],
27             "玉华宫":["游客","古董"]
28         }
29     },
30 }
31 while True:
32     for i in manue_dic:
33         print (i)
34     choose=input("请输入你的选择1：")
35     if choose in manue_dic :
36         while True:
37             for j in manue_dic[choose]:
38                 print ("\t",j)
39             choose1=input("请输入你的选择2：")
40             if choose1 in manue_dic[choose]:
41                 while True:
42                     for k in manue_dic[choose][choose1]:
43                         print ("\t\t",k)
44                     choose2=input("请输入你的选择3：")
45                     if choose2 in manue_dic[choose][choose1]:
46                         for l in manue_dic[choose][choose1][choose2]:
47                             print("\t\t\t",l )
48                         back=input("最后一层，按b返回上级菜单,按q退出：")
49                         if back==‘b‘:
50                             pass
51                         elif back==‘q‘:
52                             exit()
53                     if choose2==‘b‘:
54                         break
55                     elif choose2==‘q‘:
56                         exit()
57             if choose1==‘b‘:
58                 break
59             elif choose1==‘q‘:
60                 exit()
61     if choose==‘b‘:
62         break
63     elif choose==‘q‘:
64         exit()