python 省市区三级联动

dict_db = {
    "河南": [
        {
            "郑州": [
                "中原区",
                "金水区",
                "二七区",
                "上街区",
                "巩义市",
                "新郑市",
                "新密市",
                "登封市",
                "荥阳市",
                "中牟县"
            ]
        },
        {
            "开封": [
                "鼓楼区",
                "龙亭区",
                "禹王台区",
                "金明区",
                "开封县",
                "尉氏县",
                "兰考县",
                "杞县",
                "通许县"
            ]
        },
        {
            "南阳": [
                "卧龙区",
                "宛城区",
                "邓州市",
                "桐柏县",
                "方城县",
                "淅川县",
                "镇平县",
                "唐河县",
                "南召县",
                "内乡县"
            ]
        },
        {
            "洛阳": [
                "西工区",
                "老城区",
                "涧西区",
                "瀍河回族区",
                "洛龙区",
                "吉利区",
                "偃师市",
                "孟津县",
                "汝阳县"
            ]
        }
    ],
    "湖南": [
        {
            "长沙": [
                "岳麓区",
                "芙蓉区",
                "天心区",
                "开福区",
                "雨花区",
                "浏阳市",
                "长沙县"
            ]
        },
        {
            "岳阳": [
                "岳阳楼区",
                "云溪区",
                "君山区",
                "临湘市",
                "汨罗市",
                "岳阳县"
            ]
        },
        {
            "株洲": [
                "天元区",
                "荷塘区",
                "芦淞区",
                "石峰区",
                "醴陵市",
                "株洲县",
                "炎陵县"
            ]
        },
        {
            "湘潭": [
                "岳塘区",
                "雨湖区",
                "湘乡市",
                "韶山市",
                "湘潭县"
            ]
        }
    ],
    "广东": [
        {
            "广州": [
                "越秀区",
                "荔湾区",
                "海珠区",
                "天河区",
                "白云区",
                "黄埔区",
                "番禺区",
                "花都区"
            ]
        },
        {
            "深圳": [
                "福田区",
                "罗湖区",
                "南山区",
                "宝安区",
                "龙岗区",
                "盐田区"
            ]
        },
        {
            "珠海": [
                "香洲区",
                "斗门区",
                "金湾区"
            ]
        }
    ]
}
while True:
    print("----------------------开始打印省--------------------------")
    province_dict = {}
    province_nos = []
    for index, item in enumerate(dict_db.keys(), 1):
        print("省份id:{},      省名称:{}".format(index, item))
        province_nos.append(index)
        province_dict[index] = item
    input_pro = input("请输入省份id(quit退出)：")
    if input_pro == "quit":
        quit()
    elif int(input_pro) not in province_nos:
        print("输入省份id有误，请检查")
    elif input_pro == "back":
        break
    else:
        while True:
            print("----------------------开始打印市--------------------------")
            city_dict = {}
            city_nos = []
            for index, item in enumerate(dict_db[province_dict[int(input_pro)]], 1):
                city_nos.append(index)
                city_dict[index] = item
                for key in item.keys():
                    print("市id:{},      市名称:{}".format(index, key))
            input_city = input("请输入省份id(quit退出back返回)：")
            if input_city == "quit":
                quit()
            elif input_city == "back":
                break
            elif int(input_city) not in city_nos:
                print("输入市id有误，请检查")
            else:
                while True:
                    print("----------------------开始打印县级市--------------------------")
                    area_dict = {}
                    area_nos = []
                    for item_all in city_dict[int(input_city)].values():
                        for index, item in enumerate(item_all, 1):
                            area_nos.append(index)
                            area_dict[index] = item
                            print("区id:{},      区名称:{}".format(index, item))
                    input_area = input("请输入(quit退出back返回)：")
                    if input_area == "quit":
                        quit()
                    elif input_area.strip() == "back":
                        break
                    elif int(input_area) not in area_nos:
                        print("输入区id有误，请检查")
                    else:
                        exit()