week 1--三级菜单

zone = {    "内蒙":{        "包头":["东河区","昆都仑区","青山区","九原区"],        "呼和浩特":["新城区","回民区","玉泉区","赛罕区"],        "鄂尔多斯":["东胜区","准格尔旗","达拉特旗","伊金霍洛旗"],        "通辽":["科尔沁区","开鲁县","库伦旗","奈曼旗"],        "呼伦贝尔":["海拉尔区","满洲里","扎兰屯","牙克石"]            },    "北京":{        "东城区":["东华门","景山街","交道口","安定门"],        "西城区":["长安街","什刹海","天桥","月坛"],        "朝阳区":["三里屯","呼家楼","和平里","劲松"],        "丰台区":["右安门","太平桥","大红门","南苑"],        "石景山区":["八宝山","老山","古城","八角"]            },    "吉林":{        "长春":["南关区","宽城区","九台区","二道区"],        "吉林":["昌邑区","龙潭区","船营区","丰满区"],        "四平市":["铁西区","铁东区","公主岭","双辽"],        "辽源":["龙山区","西安区","东丰县","东辽县"],        "通化市":["东昌区","二道江区","梅河口","通化县"]            },    "辽宁":{        "沈阳":["和平区","沈河区","大东区","皇姑区"],        "大连":["中山区","西岗区","沙河口区","金州区"],        "鞍山":["铁西区","铁东区","立山区","千山区"],        "抚顺":["新抚区","东洲区","望花区","抚顺县"],        "本溪":["平山区","溪湖区","明山区","南芬区"]            }}print(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>")for province in zone:#遍历字典的key，列出省份名称    print(province)print("=====================================")province_flag = True#跳出循环标签while province_flag: for i in range(3):#指定循环3次，循环3次，退出    province_input = input("请输入省份名称 ： ")    if province_input.strip() in zone.keys():#检查输入省份名称是否在字典中        print("城市信息 ： ")        print("=====================================")        for city in zone[province_input].keys():#遍历字典的key，列出城市名称           print(city)        print("=====================================")        city_flag = True#跳出循环标签        while city_flag:            for j in range (3):#指定循环3次，循环3次，跳出循环                city_input = input("请输入城市名称 ： ")                if city_input.strip() in zone[province_input].keys():#检查输入城市名称是否在字典中                    print("区县信息 ： ")                    print("=====================================")                    for area in zone[province_input][city_input]:#遍历字典的key，列出区县名称                        print(area)                    print("=====================================")                    area_flag = True#跳出循环标签                    while area_flag:                        for k in range (3):#指定循环3次，循环3次，跳出循环                            area_input = input("请输入区县名称 ： ")                            if area_input.strip() in zone[province_input][city_input]:#检查输入城市名称是否在字典中                                print("=====================================")                                print("您所查询的信息 ： ",province_input,city_input,area_input)                                print("=====================================")                                province_flag = False#跳出循环                                city_flag = False#跳出循环                                exit()#跳出外循环                            else:                                if k!=2:                                   print("输入区县名称有误，请重新输入。。。  还有 %d 次机会。。。"%(2-k))                                   print("=====================================")                                   for area in zone[province_input][city_input]:#列出区县名称，方便重新输入                                      print(area)                                   print("=====================================")                                if k==2:                                   print("输入错误三次，请重新输入城市名称。。。")                                   print("=====================================")                                   for city in zone[province_input].keys():#列出城市名称，方便重新输入                                          print(city)                                   print("=====================================")                                area_flag = False#跳出循环                else:                    if j!=2:                       print("输入城市名称有误，请重新输入。。。  还有 %d 次机会。。。"%(2-j))                       print("=====================================")                       for city in zone[province_input].keys():#列出城市名称，方便重新输入                            print(city)                       print("=====================================")                    if j==2:                       print("输入错误三次，请重新输入省份名称。。。")                       print("=====================================")                       for province in zone:#列出省份名称，方便重新输入                          print(province)                       print("=====================================")                    city_flag = False

    else:        if i!=2:            print("输入省份名称有误，请重新输入。。。  还有 %d 次机会。。。"%(2-i))            print("=====================================")            for province in zone:#列出省份名称，方便重新输入                 print(province)            print("=====================================")        if i==2:            print("输入错误三次，退出。。。")            province_flag = False