Python编写地区选择-Dict

#!-*- coding:utf-8 -*-
"""
Mut_select of the place name.

1.1-3 to Three layer
2."q" to exit.
3."b" to back.
4.other words to retry.
5.add the values in the dict,no infact
需要改进:
在交互界面增加和删除词典里的值
"""
PlaceName = {"辽宁": {"大连": ("高新", "中山"), "沈阳": ("铁西", "浑南"), "葫芦岛": ("莲山", "兴城")},
             "吉林": {"长春": ("大洼", "高天"), "四平": ("二道河", "路阳"), "通辽": ("通化", "黑道")},
             "黑龙江": {"哈尔": ("坪山", "故阳"), "大庆": ("黑油", "千多"), "漠河": ("俄国", "最北"), "毅力": ("坚强", "努力")}}


def province(place_name):                                       # 定义选择菜单
    province_list = []
    j = 1
    for i in place_name.keys():                                 # 读取词典里的 键名
        province_list = province_list+[i]
        print(j, '.', i)                                         # 在屏幕上打印选择菜单
        j += 1
    return province_list                                         # 返回选择菜单的list


def judge_input(input_list):                                    # 判断输入
    pro_name = ""
    pr_value = input("Please select number,press 'q' to exit:")     # 获取输入的选项值
    if ('1' <= pr_value <= str(len(input_list))) and len(pr_value) == 1:         # 判断选择城市
        pro_name = input_list[int(pr_value)-1]                           # 动态赋值,词典加减项,对本程序无影响
        print("您选择%s,以下是它的1下属区域:" % pro_name)              # 打印
        return pro_name                                                  # 返回选择省/市的名字
    elif pr_value == 'q' or pr_value == 'Q':                            # 判断退出,返回值0，供主程序判断
        print("You quit the program!")
        return '0'
    elif pr_value == 'b' or pr_value == 'B':                            # 判断返回，返回值1，供主程序判断
        return '-1'
    else:
        return


while True:                                                         # 无限循环,直到输入q/Q
    ProvinceLists = province(PlaceName)                              # 调用读取词典键名函数,返回省份list
    return_value_p = judge_input(ProvinceLists)                      # 调用输入判断函数,返回输入省值
    if return_value_p == '0':                                       # 0对应q/Q ,结束程序,第一级菜单b/B无意义,无须处理
        break
    elif return_value_p in PlaceName:                                # 判断输入键值存在字典里
        CityName = PlaceName[return_value_p]                         # 读取选择省份值,存入
        while True:                                                 # 进入选择市级菜单
            CityLists = province(CityName)                           # 调用读取词典键名函数,返回城市list
            return_value_c = judge_input(CityLists)                  # 调用输入判断函数,返回输入城市值
            if return_value_c == '0':                                # 0对应q/Q,赋值,满足外层结束条件,结束程序
                return_value_p = '0'
                break
            elif return_value_c in CityName:                         # 判断输入键值存在子字典里
                CountryList = CityName[return_value_c]                # 县级元组,存入
                for name in CountryList:                             # 遍历元组值,输出
                    print(name)
                while True:                                         # 最下级菜单的输入判断
                    last_value = input("Please press 'b' to return or 'q' to quit:")
                    if last_value == 'q' or last_value == 'Q':     # q/Q设置上两级循环的退出条件,退出程序
                        return_value_c = '0'
                        return_value_p = '0'
                        break
                    elif last_value == 'b' or last_value == 'B':   # b/B退出循环
                        break
                    else:
                        continue                                    # 输入其它选项,结束本次循环
            elif return_value_c == '-1':                            # 城市层级,读取b/B,结束城市循环,返回省级
                break
            if return_value_p == '0':                               # 读取退出程序的条件,退出
                break
        if return_value_p == '0':                                   # 读取退出程序的条件,退出
            break
print('本次查询已经结束!')

#print(City["辽宁"]["沈阳"])