Python之三层菜单

三层菜单，根据用户所选数字，进入子菜单。一级一级呈现。
 1 menu = {
 2     'Beijing': {
 3         "ChaoYang": {
 4             "CBD": ['CICC', 'CCTV'],
 5             "JinRongJie": ["CT"],
 6             "Wangjing": ["Momo", "ChuiZI"]
 7         },
 8         "HaiDian": ['Baidu', 'Youku']
 9     },
10     'Shanghai': {
11         "PuDong": ["Ctrip", "One Shop"],
12         "PuXi": ["China Bank", "America Bank"]
13     }
14 }
15 exit_flag = False
16 while not exit_flag:
17     for index, key in enumerate(menu.keys()):
18         print(index, key)
19     choice_1 = input("Please choose menu to enter:").strip()
20     if choice_1.isdigit():
21         choice_1 = int(choice_1)
22 
23         key_1 = list(menu.keys())[choice_1]
24         while not exit_flag:
25             for index, key in enumerate(menu[key_1]):
26                 print('-->', index, key)
27             choice_2 = input("Please choose menu to enter:").strip()
28             if choice_2.isdigit():
29                 choice_2 = int(choice_2)
30 
31                 key_2 = list(menu[key_1].keys())[choice_2]
32                 while not exit_flag:
33                     for index, key in enumerate(menu[key_1][key_2]):
34                         print('-->-->', index, key)
35                     choice_3 = input("Please choose menu to enter:").strip()
36                     if choice_3.isdigit():
37                         print("This is the last level...")
38                     elif choice_3 == 'quit':
39                         exit_flag = True
40                     elif choice_3 == 'back':
41                         break
42 else:
43     print("====Going to quit==== ")
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注：此版本为Python3.0版本