老男孩python_12期_第一天_homework_三级菜单

city_map = {    "湖北":{"武汉":["武昌","汉阳","汉口"],            "黄冈":["黄州","红安","麻城"]},    "吉林":{"长春":["高新区","南关区"],            "四平":["东区","西区"]}}  #定义一个字典print ("--------地图--------")for i in city_map:    #遍历字典的key，列出省市的名字     print("       ",i)print ("-------------------")for i in range(3):    city_name =input("请输入你要查询的省\n")    if city_name in city_map:        sheng_name = city_map[city_name]        print ("%s省包含以下区"%city_name)        for x in sheng_name:            print (x)        shi_name = sheng_name.keys()        shi_name_input = input("请输入需要查询的市")        if shi_name_input in shi_name:            quxian_name = city_map[city_name][shi_name_input]            print("%s包含的区名有:"%shi_name_input)            for k in quxian_name:                print(k)            exit()        else:            print("输入错误")            pass    else:        print("输入错误")        passelse:    print("输入超过三次,结束")