Part1 - 三级菜单

Readme:

　　# 手动输入选择，跳到下一级

　　# ‘b‘：返回， ‘q‘：退出

流程图：

代码：

 1 #!/usr/bin/env python
 2 # coding:utf8
 3
 4 import sys
 5
 6 cn = {
 7     ‘广西‘:{
 8         ‘梧州‘: [‘蒙山县‘, ‘苍梧县‘],
 9         ‘河池‘: [‘巴马‘],
10         ‘靖西‘: [‘旧州‘, ‘鹅泉风景区‘]
11     },
12     ‘云南‘:{
13         ‘大理‘: [‘宾川县‘, ‘洱源县‘],
14         ‘普洱‘: [‘思茅区‘]
15     }
16 }
17
18 meg = "(‘b‘:返回, ‘q‘:退出)"
19
20 while True:
21     # 显示省份列表
22     for p in cn.keys():
23         print(p)
24     print(meg)
25     A = input("choice:")
26     if len(A) == 0: continue
27     if A == ‘b‘: break
28     if A == ‘q‘: sys.exit(1)
29
30     while True:
31         # 显示城市列表
32         for city in cn.get(A).keys():
33             print(city)
34         print(meg)
35         B = input("choice:")
36         if len(B) == 0: continue
37         if B == ‘b‘: break
38         if B == ‘q‘: sys.exit(1)
39
40         while True:
41             # 显示县、区列表
42             for county in cn.get(A).get(B):
43                 print(county)
44             print(meg)
45             C = input("choice:")
46             if len(C) == 0: continue
47             if C == ‘b‘: break
48             if C == ‘q‘: sys.exit(1)