今天就來點應用的，透過之前所學的，加上前一篇的字典後，我們就來實作三層式地址查詢的功能

目前需求是：

• 要建立一個有三層式的地址清單，如：城市、行政區、里名、道路名
• 可以隨時返回上一層查詢
• 可以隨時退出程式

大家可以先想想，怎麼做呢？等等後續再更新上來

來來更新嚕，先上一版未優化的，雖然看起來很醜，但...基本上功能都有做到了

#!/usr/bin/env python3
# -*- coding:utf-8 -*-

data = {
    "台北市":{
        "中正區":{
            "水源里":["羅斯福路4段"],
            "富水里":["永春街"],
            "文盛里":["羅斯福路3段"],
         },
        "大同區":{
            "國順里":["延平北路3段"],
            "建明里":["重慶北路一段"],
            "光能里":["民生西路"],
        },
        "信義區":{
            "西村里":["基隆路1段"],
            "正和里":["仁愛路4段"],
            "興隆里":["基隆路1段"],
        },

    },
    "新北市":{
        "板橋區":{
            "黃石里":["宮口街"],
            "自強里":["中正路"],
            "金華里":["金華街"],
        },
        "中和區":{
            "中原里": ["永和路"],
            "連和里": ["連城路"],
            "連城里": ["連城路"],
        },
        "新莊區":{
            "中平里": ["中平路"],
            "中原里": ["中港路"],
            "昌平里": ["中華路2段"],
        },
    },
    "台中市":{
        "北屯區":{
            "北屯里": ["太原路"],
            "北京里": ["國校巷"],
            "北興里": ["北屯路"],
        },
        "后里區": {
            "廣福里": ["寺山路"],
            "仁里里": ["圳寮路"],
            "義里里": ["梅里路"],
        },
        "北區": {
            "頂厝里": ["永興街"],
            "賴村里": ["梅亭街"],
            "賴旺里": ["中清路一段"],
        }
    }
}

exit_flag = False

while not exit_flag:
    for city in data:
        print(city)
    choice_city = input("請選擇你要的城市:")
    if choice_city in data:
        while not exit_flag:
            for district in data[choice_city]:
                print("\t", district)
            choice_district = input("請選擇你要的行政區:")
            if choice_district in data[choice_city]:
                while not exit_flag:
                    for li in data[choice_city][choice_district]:
                        print("\t\t", li)
                    choice_li = input("請選擇你要的里名:")
                    if choice_li in data[choice_city][choice_district]:
                        for road in data[choice_city][choice_district][choice_li]:
                            print("\t\t", road)
                        choice_back = input("已到最底層了，按b返回上一層:")
                        if choice_back == "b":
                            pass
                        elif choice_back == "q":
                            exit_flag = True
                    if  choice_li == "b":
                        break
                    elif choice_li == "q":
                        exit_flag = True
            if choice_district == "b":
                break
            elif choice_district == "q":
                exit_flag = True
    if choice_city == "q":
        exit_flag = True

我不知道『里』的英文是啥，只好用『li』代替了 @@"