Python基本数据结构之字典嵌套（例子）

北京城市地区之间的嵌套

 # coding=gbk
 #Created on 2019/5/20
 #@author: XiaoHu

 menu = {
     '北京': {
         '朝阳': {
             '国贸': {
                 'CICC': {},
                 'HP': {},
                 '中国银行': {},
                 'CCTV': {},
             },
             '望京': {
                 '陌陌': {},
                 '奔驰': {},
                 '': {},
             },
             '三里屯': {
                 '优衣库': {},
                 'apple': {},
             },
         },
         '昌平': {
             '沙河': {
                 "老男孩": {},
                 "阿泰包子": {},
             },
             '天通苑': {
                 "链家": {},
                 "我爱我家": {},
             },
             '回龙观': {},
         },
         '海淀': {
             "五道口": {
                 "谷歌": {},
                 "网易": {},
                 "Sohu": {},
                 "快手": {},
             },
             "中关村": {
                 "优酷": {},
                 "爱奇艺": {},
                 "汽车之家": {},
                 "新东方": {},
                 "QQ": {},
             },
         },
     },

     '上海': {
         "浦东": {
             "陆家嘴": {
                 "CICC": {},
                 "高盛": {},
                 "摩根": {},
             },
             "外滩": {},
         },
         "闵行": {},
         "静安": {},
     },

     '山东': {
         "济南": {

         },
         "德州": {
             "乐林": {
                 "丁坞镇": {},
                 "城区": {},
             },
             "平原": {},
         },
         "青岛": {},
     },
 }

 current_layer =  menu
 parent_layer = menu

 parent_layers = []

 while True:
     for key in current_layer:
         print(key)
     choice = input(">>>:").strip()
     if len(choice) == 0:continue
     if choice in current_layer:
         parent_layers.append(current_layer)
         current_layer = current_layer[choice]
     elif choice == "b":
         if parent_layers:
             current_layer = parent_layers.pop()
     else:
         print("无此项")