首先非常感谢11期的学长薜保库提供了一种非常实用函数递归方法，让实现三层菜单如此简单，不过对所遍历的嵌套字典或列表格式有所要求。有特定的环境下非常实用。

主要针对中国的各省市区进行展示，采用了百度的js接口：

http://passport.baidu.com/js/sitedata_bas.js

格式大概如下：

var sitedata =

[

    { name:"请选择", sub:[{name:"请选择"}], type:1},

    { name:"北京",  sub:[{name:"请选择"},{name:"东城区"},{name:"西城区"},{name:"崇文区"},{name:"宣武区"},{name:"朝阳区"},{name:"海淀区"},{name:"丰台区"},{name:"石景山区"},{name:"房山区"},{name:"通州区"},{name:"顺义区"},{name:"昌平区"},{name:"大兴区"},{name:"怀柔区"},{name:"平谷区"},{name:"门头沟区"},{name:"密云县"},{name:"延庆县"},{name:"其他"}], type:0},

    { name:"广东",  sub:[{name:"请选择",sub:[]},

	   { name:"广州",  sub:[{name:"请选择"},{name:"越秀区"},{name:"荔湾区"},{name:"海珠区"},{name:"天河区"},{name:"白云区"},{name:"黄埔区"},{name:"番禺区"},{name:"花都区"},{name:"南沙区"},{name:"萝岗区"},{name:"增城市"},{name:"从化市"},{name:"其他"}],type:0},
           { name:"深圳",  sub:[{name:"请选择"},{name:"福田区"},{name:"罗湖区"},{name:"南山区"},{name:"宝安区"},{name:"龙岗区"},{name:"盐田区"},{name:"其他"}], type:0},

           { name:"珠海",  sub:[{name:"请选择"},{name:"香洲区"},{name:"斗门区"},{name:"金湾区"},{name:"其他"}],type:0},

		   {

           { name:"汕头",  sub:[{name:"请选择"},{name:"金平区"},{name:"濠江区"},{name:"龙湖区"},{name:"潮阳区"},{name:"潮南区"},{name:"澄海区"},{name:"南澳县"},{name:"其他"}],type:0},

           { name:"韶关",  sub:[{name:"请选择"},{name:"浈江区"},{name:"武江区"},{name:"曲江区"},{name:"乐昌市"},{name:"南雄市"},{name:"始兴县"},{name:"仁化县"},{name:"翁源县"},{name:"新丰县"},{name:"乳源瑶族自治县"},{name:"其他"}],type:0},

 }

具体代码如下：

#!/usr/bin/env python

# -*- coding:utf-8 -*-

__author__ = 'xuebk'

import logging

import sys

reload(sys)

sys.setdefaultencoding('utf-8')

logger = logging.getLogger(__name__)

def search_a(sitedata,search=None):

    if search is None:

        for x in sitedata:

            print x['name'],",",

        print

        search = raw_input('请输入相应名称.:')

    print "search:"+search

    for i in sitedata:

        if search != i['name']:

            continue

        print('查询到%s'%(i['name']))

        if 'sub' in i.keys():

            search_a(i['sub'])

if __name__ == '__main__':

    search_a(sitedata_bas)