Python代碼之三級登錄

# -*- coding:utf-8 -*-
#Author:Mr Gan

china_map ={
            "華南區":
             {
            "廣東省":{"廣州市":["越秀區","天河區"],"東莞市":["哥台區","滄桑區"]},
            "海南省":{"海口市":["龍河區","丰台區"],"三亞市":["蒼山區","晉安區"]}
             },
            "華北區":
            {
            "河北省":{"石家莊市":['台州區','河內區'],"唐山市":['臺南區','雄安區']}
            }}
while True:
    for i in china_map:#遍歷第一級key
        print(i)
    choice_1 = input("選擇進入》》：")
    if choice_1 in china_map:
        while True:
            for i2 in china_map[choice_1]:#遍歷第二級key
                print("\t\t",i2)
            choice_2 = input("選擇進入》》：")
            if choice_2 == "q":
                break
            if choice_2 in china_map[choice_1]:
                while True:
                    for i3 in china_map[choice_1][choice_2]:#遍歷第三級key
                        print("\t\t\t\t", i3)

                    choice_3 = input("選擇進入》》：")
                    if choice_3 == "q":
                        break
                    if choice_3 in china_map[choice_1][choice_2]:
                        while True:
                            for i4 in china_map[choice_1][choice_2][choice_3]:
                                print("\t\t\t\t\t\t",i4)
                            choice_4 = input("最後一層，按q返回：")
                            if choice_4 == "q":
                                break
                            else:
                                pass

代碼有點low