python:關於三級菜單的新手實現

#實現省市級的三級菜單

#！/user/bin/env python
citys={"廣東省":{"廣州市":["番禺區","天河區","白雲區"],
                  "深圳市":["南山區","寶安區","羅湖區"],
                  "惠州市":["惠東","惠陽","淡水"]},
       "湖南省":{"武漢":["黃鶴樓","戶部巷","東湖"],
                  "宜昌":["三峽大壩","葛洲壩","西峽"],
                  "恩施":["神農溪","恩施土司城","女兒城"]},
       "河北省":{"北京":["故宮","天安門","八達嶺"],
                  "太原":["晉祠","柳巷","聖母殿"],
                  "石家莊":["趙州橋","隆興寺","西柏波"]}}
print(citys["廣東省"]["廣州市"])
while True:
    for a in citys.keys():
        print(a)
    city=input("請輸入需要瞭解的城市：")
    if city in citys and city=="廣東省":
        for b in citys[city].keys():
            print(b)

        area = input("請輸入需要瞭解的區域：")
        if area in citys[city] and area == "廣州市":
            for b in citys[city][area]:
                print(b)
            turn = input("按任意鍵返回上一層,按q退出程式")
            if turn == "q":
                break
            else:
                continue

上面的代碼實現的只是簡單而繁瑣的一種，後面的代碼會一直重覆，因此並沒有寫下去，後面的是我看視頻附帶的代碼，我也附上，較我寫的完整一些

data = {
    '北京':{
        "昌平":{
            "沙河":["oldboy","test"],
            "天通苑":["鏈家地產","我愛我家"]
        },
        "朝陽":{
            "望京":["賓士","陌陌"],
            "國貿":{"CICC","HP"},
            "東直門":{"Advent","飛信"},
        },
        "海澱":{},
    },
    '山東':{
        "德州":{},
        "青島":{},
        "濟南":{}
    },
    '廣東':{
        "東莞":{},
        "常熟":{},
        "佛山":{},
    },
}
exit_flag = False

while not exit_flag:
    for i in data:
        print(i)
    choice = input("選擇進入1>>:")
    if choice in data:
        while not exit_flag:
            for i2 in data[choice]:
                print("\t",i2)
            choice2 = input("選擇進入2>>:")
            if choice2 in data[choice]:
                while not exit_flag:
                    for i3 in data[choice][choice2]:
                        print("\t\t", i3)
                    choice3 = input("選擇進入3>>:")
                    if choice3 in data[choice][choice2]:
                        for i4 in data[choice][choice2][choice3]:
                            print("\t\t",i4)
                        choice4 = input("最後一層，按b返回>>:")
                        if choice4 == "b":
                            pass
                        elif choice4 == "q":
                            exit_flag = True
                    if choice3 == "b":
                        break
                    elif choice3 == "q":
                        exit_flag = True
            if choice2 == "b":
                break
            elif choice2 == "q":
                exit_flag = True

今天 2017/08/22，突然發現昨天的程式可以進行優化，可以實現每個省市級都進行選擇

#實現省市級的三級菜單

#！/user/bin/env python
citys={"廣東省":{"廣州市":["番禺區","天河區","白雲區"],
                  "深圳市":["南山區","寶安區","羅湖區"],
                  "惠州市":["惠東","惠陽","淡水"]},
       "湖南省":{"武漢":["黃鶴樓","戶部巷","東湖"],
                  "宜昌":["三峽大壩","葛洲壩","西峽"],
                  "恩施":["神農溪","恩施土司城","女兒城"]},
       "河北省":{"北京":["故宮","天安門","八達嶺"],
                  "太原":["晉祠","柳巷","聖母殿"],
                  "石家莊":["趙州橋","隆興寺","西柏波"]}}
print(citys["廣東省"]["廣州市"])
while True:
    for a in citys.keys():
        print(a)
    city=input("請輸入需要瞭解的城市：")
    for b in citys[city].keys():
        print(b)

    area = input("請輸入需要瞭解的區域：")

    for b in citys[city][area]:
        print(b)
    turn = input("按任意鍵返回上一層,按q退出程式")
    if turn == "q":
        break
    else:
        continue
else:
     pass