1 #!/usr/bin/env python
 2 #__author: hlc
 3 #date: 2019/5/29
 4
 5 menu = {
 6     '北京': {
 7         '海淀': {
 8             '五道口': {
 9                 'soho': {},
10                 '网易': {},
11                 'google': {}
12             },
13             '中关村': {
14                 '爱奇艺': {},
15                 '汽车之家': {},
16                 'youku': {},
17             },
18             '上地': {
19                 '百度': {},
20             },
21         },
22         '昌平': {
23             '沙河': {
24                 '老男孩': {},
25                 '北航': {},
26             },
27             '天通苑': {},
28             '回龙观': {},
29         },
30         '朝阳': {},
31         '东城': {},
32     },
33     '上海': {
34         '闵行': {
35             "人民广场": {
36                 '炸鸡店': {}
37             }
38         },
39         '闸北': {
40             '火车战': {
41                 '携程': {}
42             }
43         },
44         '浦东': {},
45     },
46     '山东': {},
47 }
48 current_layer = menu
49 parent_layer = []
50 while True :
51     for key in current_layer :
52         print(key)
53     choice = input("input_menu_name('q'退出)>>>:").strip()
54     if len(choice) == "0" :continue
55     if choice in current_layer :
56         parent_layer.append(current_layer)
57         current_layer = current_layer[choice]
58     elif choice == "b" :
59         if parent_layer :
60             current_layer = parent_layer.pop()
61     elif choice == "q" :
62         break
63     else:
64         print("无此项。。。。")