用戶交互，顯示省市縣三級聯動的選擇
要求：用戶輸入河北，則打印河北省下的市，用戶輸入市，則顯示該河北省的這個市下的縣

 1 dic = {
 2     "河北": {
 3         "石家莊": ["鹿泉", "槁城", "元氏"],
 4         "邯鄲": ["永年", "涉縣", "磁縣"],
 5     },
 6     "河南": {
 7         ...
 8     },
 9     "山西": {
10         ...
11 },
12 }
13 while True:
14     for i in dic:
15         print
 
(i)
16     shengcheng = input(‘請輸入省[q退出]： ‘).strip()
17     if shengcheng == ‘q‘:
18         exit()
19     elif shengcheng in dic:
20         while True:
21             for i2 in dic[shengcheng]:
22                 print(i2)
23             shixian = input(‘請輸入市[q返回上一層] ： ‘).strip()
24             if shixian in
 
 dic[shengcheng]:
25                 while True:
26                     for i3 in dic[shengcheng][shixian]:
27                         print(i3)
28                     fh = input(‘只有這些了,輸入q返回上一層： ‘)
29                     if fh == ‘q‘:
30                         break
31                     else:
32                             print
 
(‘請重新輸入！‘)
33             elif shixian == ‘q‘:
34                 break
35             else:
36                 print(‘請重新輸入！‘)
37     else:
38         print(‘請重新輸入！‘)

python學習-三級菜單省市選擇