Python은 3단계 while 루프 메뉴 예제를 작성합니다.

下面这篇文章介绍python是如何编写一个三级while的循环菜单的

1.定义字典，字典里面嵌套字典，内嵌字典的值为列表。

思路：

<strong><span style='font-family: "Microsoft YaHei"; font-size: 14px'>湖北省的市：字典中的</span></strong><br><strong><span style='font-family: "Microsoft YaHei"; font-size: 14px'>定义3个字典，用于存储</span></strong><br><br><strong><span style='font-family: "Microsoft YaHei"; font-size: 14px'>{序列-键：市名}</span></strong>

shiqu_dir = {}

{序列-键：县}

xian_dir ={}

{序列-键：街道}

jiedao_dir = {}

函数将序列和键一一对应。

<strong><span style='font-family: "Microsoft YaHei"; font-size: 14px'>for number,key in enumerate(Hbei_map.keys())  获取序列键和市名存储到 市名字典</span></strong><br><br><strong><span style='font-family: "Microsoft YaHei"; font-size: 14px'>用一个列表 chose = [] 来存储所选择的市--县程-街道</span></strong>

<strong><span style='font-family: "Microsoft YaHei"; font-size: 14px'>chose[0],chose[1],chose[2]最后使用切片返回</span></strong><br><br><strong><span style='font-family: "Microsoft YaHei"; font-size: 14px'>中间输入全部使用的判断方式for循环： for k,v in xxx.items():</span></strong><br><strong><span style='font-family: "Microsoft YaHei"; font-size: 14px'>　　　　　　　　　　　　　　　　　　　　　if input == k：</span></strong><br><strong><span style='font-family: "Microsoft YaHei"; font-size: 14px'>让用户只能输入序列中的数字。使用判断语句：</span></strong>

<strong><span style='font-family: "Microsoft YaHei"; font-size: 14px'>　　if int(input) not in 字典.keys():</span></strong><br><strong><span style='font-family: "Microsoft YaHei"; font-size: 14px'>    　　print("您输入了非法的序列,请输入一下序列 {}".format(shiqu_list))</span></strong><br><br>

# -*- coding: utf-8 -*-__author__ = 'hujianli'import sys
Hbei_map = {"武汉市":{"江岸区":["上海街","大智街","一元街","车站街","四唯街","永清街","球场街","西马街","台北街","劳动街","花桥街","后湖街","谌家矶街"],         "硚口区":["易家墩街道","韩家墩街道","宗关街道","汉水桥街道","宝丰街道","荣华街道","崇仁街道","汉中街道"],         "武昌区":["积玉桥街道","杨园街道","徐家棚街道","新河街道"]
    },"荆州市":{"沙市区":["黄石港","崇文街道","解放路街道"],"荆州区":["城南街道","西城街道","东城街道","马山镇","川店镇"],"松滋市":["新江口镇","南海镇","八宝镇","陈店镇"],"公安县":["斗湖堤镇","埠河镇","杨家厂镇","斑竹垱镇"],"监利县":["容城镇","白螺镇","朱河镇"]

    },"孝感市":{"孝南区":["肖港镇","书院街道","车站街道","新华街道"],"应城市":["城中街道","城北街道","杨河镇","三合镇"],"安陆市":["李店镇","巡店镇","雷公镇","陈店乡"],

    },
}# print(Hbei_map["孝感市"]["应城市"])shiqu_dir = {}
xian_dir ={}
jiedao_dir = {}def jiance(name):if len(name) == 0:
        sys.exit("\033[31;1m选择不能为空，清重新输入~~\033[0m")elif shiqu == "quit" or shiqu == "exit":
        sys.exit("\033[31;1m 退出程序，三级菜单退出~~ \033[0m")else:return Trueprint("==============================================================================================================")print("湖北省下面的市区如下： ")for number,key in enumerate(Hbei_map.keys()):print(str(number+1) + ": " + str(key))
    shiqu_dir[number+1] = key

chose = []
shiqu_list = [x+1 for x in range(len(shiqu_dir.keys()))]while True:print("==========================================================================================================")
    shiqu = input("请输入您要查询的市区所对应的序列号,输入exit或者quit自动会退出.：")
    jiance(shiqu)if int(shiqu) not in shiqu_dir.keys():print("您输入了非法的序列,请输入一下序列 {}".format(shiqu_list))else:for keys,vlaue in shiqu_dir.items():if int(shiqu) == keys:
                chose = []
                chose.append(vlaue)print("================================================================================================")print("该市区下面的县级市或者片区域，县城列表如下：")for number,keys_xian in enumerate(Hbei_map[vlaue].keys()):print(str(number+1)+ ":" + str(keys_xian))
                    xian_dir[number+1] = keys_xianwhile True:print("=============================================================================================")
                    xian = input("请输入要查询的县城所对应的序列号，quit/exit退出： ")
                    jiance(xian)
                    xian_list = [x+1 for x in range(len(xian_dir.keys()))]if int(xian) not in xian_dir.keys():                         print("您输入了非法的序列,请输入一下序列 {}".format(xian_list))else:for k,v in xian_dir.items():if int(xian) == k:
                                chose.append(v)

                        jiedao_li = Hbei_map[chose[0]][chose[1]]for k,v in enumerate(jiedao_li):print(str(k+1) + ": " + str(v))
                            jiedao_dir[k+1] = vwhile True:print("=====================================================================================")
                            jiedao = input("请输入街道所对应的序列号 退出请输入quit/exit： ")
                            jiance(jiedao)
                            jiedao_list = [x+1 for x in range(len(jiedao_dir.keys()))]if int(jiedao) not in jiedao_dir.keys():print("您输入了非法的序列,请输入一下序列 {}".format(jiedao_list))else:for k,v in jiedao_dir.items():if int(jiedao) == k:
                                        chose.append(v)print("=================================================================================")print("\033[35;1m你选择的市：%s 县城是：%s 街道是：%s\033[0m"%(chose[0],chose[1],chose[2]))print("===================================================================================")breakbreakbreak

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