Python代码之三级登录

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

china_map ={
            "华南区":
             {
            "广东省":{"广州市":["越秀区","天河区"],"东莞市":["哥台区","沧桑区"]},
            "海南省":{"海口市":["龙河区","丰台区"],"三亚市":["苍山区","晋安区"]}
             },
            "华北区":
            {
            "河北省":{"石家庄市":['台州区','河内区'],"唐山市":['台南区','雄安区']}
            }}
while True:
    for i in china_map:#遍历第一级key
        print(i)
    choice_1 = input("选择进入》》：")
    if choice_1 in china_map:
        while True:
            for i2 in china_map[choice_1]:#遍历第二级key
                print("\t\t",i2)
            choice_2 = input("选择进入》》：")
            if choice_2 == "q":
                break
            if choice_2 in china_map[choice_1]:
                while True:
                    for i3 in china_map[choice_1][choice_2]:#遍历第三级key
                        print("\t\t\t\t", i3)

                    choice_3 = input("选择进入》》：")
                    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("最后一层，按q返回：")
                            if choice_4 == "q":
                                break
                            else:
                                pass

代码有点low