多级菜单（增强版）

 1 #__Author__ oliver
 2 #__Date__ 2016/8/26
 3 
 4 
 5 with open('省市县','r',encoding='utf-8') as f_read:
 6     data = f_read.readlines()   #将文件内容放入大列表
 7     # data = f_read.read()      #直接读出字符串
 8 zone = eval(''.join(data))     #获取地区字典
 9 current_layer = dict(zone)
10 parent_layer = []
11 while True:
12     for key in current_layer:
13         print(key)
14     choice = input("Press <a> Add,press <m> Modify,press <d> Delete;press <b> back,press <q> Quit.\n>>>:").strip()
15     if len(choice) == 0:
16         continue
17     if choice in current_layer:
18         parent_layer.append(current_layer)
19         current_layer = current_layer[choice]
20         if current_layer == {}:
21             print("已到最后一级。")
22     elif choice == 'b':
23         if parent_layer:
24             current_layer = parent_layer.pop()
25     elif choice == 'q':
26         while parent_layer != []:
27             current_layer = parent_layer.pop()
28         break
29     elif choice == 'a': # add操作
30         new_item = input("请输入新地区>>>").strip()
31         if new_item in current_layer:
32             print("地区%s已存在，请重新输入。\n"%new_item)
33         else:
34             new_dic = {}
35             current_layer.setdefault(new_item,new_dic) #增加菜单
36     elif choice == 'd':
37         del_item = input("请输入删除项>>>")
38         if del_item in current_layer:
39             del current_layer[del_item]              #删除菜单
40         else:
41             print("菜单中没有'%s'地区！\n"%del_item)
42     elif choice == 'm':
43         modify_item = input("请输入修改项>>>").strip()
44         save_value = current_layer[modify_item]    #保存用户输入的key对应的value
45         modify_key = input("请输入新地区>>>").strip()
46         del current_layer[modify_item]
47         modify_dic = {modify_key : save_value}      #新键值对
48         current_layer.update(modify_dic)            #将新的键值对添加到字典中
49     else:
50         print("无此项！\n")
51 with open('省市县_new','w',encoding='utf-8') as f_write:
52     f_write.write(str(current_layer))
多级菜单（增强版）

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