使用python实现省市三级菜单效果

#!/user/binenv python3
# -*- coding:utf-8 -*-
 
'''
Created on: 2015年1月16日
 
@author: 吕毅
 
Email: 371725153@qq.com
 
Version: 1.0
 
'''
 
 
china_map ={
 "华南":{
  "广东":["广州市","佛山市","深圳市","东莞市"],"广西":["南宁市","柳州市","桂林市","北海市"],"海南":["海口市","三亚市","三沙市","儋州市"]
 
 },"华东":{
  "上海":["黄浦区","卢湾区","徐汇区","长宁区","普陀区"],"安徽":["合肥市","芜湖市","淮南市","马鞍山市"],"江苏":["南京市","无锡市","徐州市","常州市","苏州市"]
 
 },"华北":{
  "北京":["东城区","西城区","朝阳区","丰台区","石景山区","海淀区"],"山西":["太原市","大同市","阳泉市","长治市"],"河北":["石家庄市","唐山市","秦皇岛市","邢台市"]
 
 },"华中":{
  "湖北":["武汉市","黄石市","十堰市","十堰市"],"河南":["郑州市","开封市","洛阳市","平顶山市"],"湖南":["长沙市","株洲市","衡阳市","邵阳市"]
 
 },"西南":{
  "重庆":["万州区","涪陵区","渝中区","大渡口区"],"四川":["成都市","自贡市","攀枝花市","德阳市"],"贵州":["贵阳市","六盘水市","遵义市","安顺市"],},"特别行政区":{
  "香港":["屯门","弯仔","北角","西贡"],"澳门":["花地玛堂区","圣安多尼堂区","大堂区","望德堂区"],}
 
 
print ("-------------------------------------------------")
print ("+            +")
print ("+            +")
print ("+   欢迎来到大中华地区查询系统地   +")
print ("+            +")
print ("+            +")
print ("-------------------------------------------------")
print ("大中华地区一级划分:")
for i in china_map: #遍历字典的key，列出大中华地区的名字
 
 print (i)
print ("-------------------------------------------------")
jump_flag = False #用于跳出外循环
for i in range(3): #外循环，指定循环3次，3次外循环完了，就退出程序
 greater_china_name = input("请输入你要查看的大中华地区名字:")
 if greater_china_name in china_map: #检查输入的地区是否在地图中，如果地区名字3次输入错误，程序退出
  gc_name = china_map[greater_china_name]
  province_name = gc_name.keys()#使用输入的信息作为key，取出省信息，存在字典中
  while True: #内循环，死循环，不指定循环次数，通过break或者flag跳出
   print ("------------------包含的省名字二级:-----------------") #分隔线
   for i in province_name: #遍历列表，取出省名字，打印出来
    print (i)
   print ("-------------------------------------------------") #分隔线
   sheng_name_input = input("请输入你要查看的省名字:")
 
   if sheng_name_input in province_name: #判断输入的省名字是否在地区列表中
    shi_name = china_map[greater_china_name][sheng_name_input] #取出省中有哪些市，存在列表中
    print ("--------------包含的城市名三级:-------------------") #分隔线
    for i in shi_name: #遍历列表，取出地区市名字，打印出来
     print (i)
    print ("------------------------------------------------") #分隔线
 
   if sheng_name_input not in province_name: #如果输入的省名字不在在地区列表中
    print ("输入的省名字不对，请重新输入")
    continue #跳出当次迭代，开始下一次迭代循环，直到地市名字输入正确为止(不停的要求输入)
   back_or_quit = input("请问是否退出？按b:Back是返回上一级菜单;按q:Exit是退出整个程序")
   #显示完地区市后，就要退出程序了，一个是全部退出，一个是返回上一级菜单
   if back_or_quit == "q":
    jump_flag = True #用于跳出外循环
    break #跳出while内循环
   if back_or_quit == "b":
    continue # 跳出当次迭代，开始下一次迭代循环,重新输入省处，返回上一步
   print ("你输入的信息有误，请重新输入")
  if jump_flag: #跳出外循环的条件满足
   break #跳出外循环
else:#上面的3次for循环正常执行完毕，else才会执行，如果是不正常退出（break），else不会执行
 print ("3次输入错误，程序退出")