Python之 七级字典查询

 # -*- coding:utf- -*-

 # 作业要求：
 # 打印直辖市，省，市，县，区，街道五级菜单；
 # 可以一层一层地进入到所有层
 # 可以退出到上一层
 # 可随时退出程序

 mapChina = {
     "中华人民共和国": {
         "北京": {
             "市区": {
                 "东城区": {},
                 "西城区": {},
                 "朝阳区": {},
                 "海淀区": {},
                 "石景山区": {},
                 "丰台区": {},
             },
             "远郊区": {
                 "顺义区": {},
                 "怀柔区": {},
                 "密云区": {},
                 "延庆县": {},
                 "昌平区": {},
                 "平谷区": {},
                 "门头沟区": {},
                 "房山区": {},
                 "通州区": {},
             },
         },
         "湖南": {
             "长沙市": {
                 "望城县": {},
                 "宁乡县": {},
                 "浏阳县级市": {},
                 "长沙县": {
                     "福临镇": {},
                     "白沙乡": {},
                     "高桥镇": {},
                     "黄花镇": {},
                     "暮云镇": {},
                     "跳马镇": {},
                     "果园镇": {},
                     "黄花镇": {
                         "泉塘安置小区": {
                             "中联重科": {
                                 "思想构筑未来": "志存无息，博厚悠远",
                             },
                             "很多学校": {
                                 "各种学校": "各种湖南小吃",
                             },
                         },
                         "黄花机场": {},
                         "湖南农业大学": {},
                         "徐特立公园": {},

                     },
                 },
             },
             "株洲市": {
                 "攸县": {},
                 "茶陵": {},
                 "炎陵": {},
                 "醴陵": {},
             },
             "湘潭市": {},
             "衡阳市": {},
             "邵阳市": {},
             "岳阳市": {},
             "常德市": {},
             "张家界市": {},
             "益阳市": {},
             "郴州市": {},
             "永州市": {},
             "娄底市": {},
             "怀化市": {},
             "湘西少数民族自治区": {},
         },
         "重庆": {},
         "四川": {},
         "江西": {},
         "陕西": {},
         "福建": {},
         "上海": {},
         "浙江": {},
         "其他省市自治区直辖市": {},
     }
 }

 # print(type(mapChina["中华人民共和国"]))
 # print(mapChina["中华人民共和国"]["湖南"])
 # print(mapChina["中华人民共和国"]["湖南"]["长沙市"]["长沙县"]["黄花镇"]["泉塘安置小区"]['中联重科'])

 choose_list = []
 mapChina_new = mapChina

 print("输入‘b’键返回上一层，输入‘q’键退出到初始界面，输入‘qq’直接退出程序。")
 print(mapChina.keys())

 while True:

     choose = input("请输入需要访问的区域名称： ")
     if choose == 'qq':
         break
     elif choose == 'q':
         mapChina_new = mapChina
         continue
     elif choose == "b":
         if mapChina_new == mapChina:
             continue
         else:
             mapChina_new = choose_list.pop()
             for key1 in mapChina_new.keys():
                 print(key1)
     elif choose in mapChina_new.keys():
         choose_list.append(mapChina_new)
         mapChina_new = mapChina_new[choose]
         for key in mapChina_new.keys():
             print(key)
     elif not mapChina_new.values():
         print("这是最后一层了，请输入‘b’键返回")
         continue
     else:
         print("Invalid Input.Try Again!")