python3初识 之 简单目录练习

 1 # -*- coding: utf-8 -*-
 2 ‘‘‘ 
 3 Accounting:三级目录，输入目录中选项进入下一级，输入b返回上一级，
 4 输入q退出程序，输入其他内容则当前目录继续输入
 5 ‘‘‘
 6 dict = {
 7     ‘北京‘:{
 8         ‘朝阳‘:{
 9             ‘朝阳群众‘:{
10                 ‘路人甲‘:{},
11                 ‘路人乙‘:{},
12                 ‘路人丙‘:{}
13             },
14             ‘朝阳群众2‘:{}
15         },
16         ‘海淀‘:{},
17         ‘昌平‘:{}
18     },
19     ‘上海‘:{},
20     ‘广州‘:{}
21 }
22 exit_flag = False #退出标志位
23 while not exit_flag:
24     for i in dict:
25         print(i)
26     chioce = input(‘选择进入层级1--->>‘)
27     if chioce in dict:
28         while not exit_flag:
29             for i2 in dict[chioce]:
30                 print(i2)
31             chioce2 = input(‘选择进入层级2--->>‘)
32             if chioce2 in dict[chioce]:
33                 while not exit_flag:
34                     for i3 in dict[chioce][chioce2]:
35                         print(i3)
36                     chioce3 = input(‘选择进入层级3--->>‘)
37                     if chioce3 in dict[chioce][chioce2]:
38                         while not exit_flag:
39                             for i4 in dict[chioce][chioce2][chioce3]:
40                                 print(i4)
41                             chioce4 = input(‘最后层级，输入b返回上一层级--->>‘)
42                             if chioce4 == ‘b‘:
43                                 pass
44                             elif chioce4 == ‘q‘:
45                                 exit_flag = True
46                     elif chioce3 == ‘b‘:
47                         break
48                     elif chioce3 == ‘q‘:
49                         exit_flag = True
50             elif chioce2 == ‘b‘:
51                 break
52             elif chioce2 == ‘q‘:
53                 exit_flag = True
54     elif chioce == ‘q‘:
55         exit_flag = True
在练习时把判断与循环顺序搞错了，头痛了好一阵（if 与 while）