Level 3 menu

实现三级菜单功能。

#!/usr/bin/env python
#-*- coding:utf-8 -*-
# Li Rong Yang
"""
This Level 3 menu.
"""
 
#定义字典
dic = {"山东":
            {"青岛" : ['四方','黄岛','崂山','李沧','城阳'],
            '济南' : ['历城','槐荫','高新','长青','章丘'],
            '烟台' : ['龙口','莱山','牟平','蓬莱','招远']},
        "江苏":
            {"苏州" : ['沧浪','相城','平江','吴中','昆山'],
            '南京' : ['白下','秦淮','浦口','栖霞','江宁'],
            '无锡' : ['崇安','南长','北塘','锡山','江阴']},
        "安徽":
            {"安徽" : ['蜀山','庐阳','包河','经开','新站'],
            '芜湖' : ['镜湖','鸠江','无为','三山','南陵'],
            '蚌埠' : ['蚌山','蚌山','淮上','怀远','固镇']},
        "广东":
            {"深圳" : ['罗湖','福田','南山','宝安','布吉'],
            '广州' : ['天河','珠海','越秀','白云','黄埔'],
            '东莞' : ['莞城','长安','虎门','万江','大朗']}
    }
 
 
while True:
    print("-----------  中国省级地图  -----------")
    for _dic in dic.keys():#打印省份
        print(_dic)
 
    province = input("Please enter the province you want to view.")
    if province in dic.keys():#打印市级城市
        print("-----------  中国市级地图  -----------")
        for city in dic[province].keys():
            print(city)
 
        county = input("Please enter the city you want to view.")
        if county in dic[province].keys():#打印县级城市
            print("-----------  中国县级地图  -----------")
            for _county in dic[province][county]:
                print(_county)
 
    else:
        continue
 
    user_choose = input("Do you want to return to the home page? Y over N, choose N to exit the software")
    print("")
 
    if user_choose != "Y" and user_choose != "y":
        exit()
　　