Python使用bs4获取58同城城市分类的方法

# -*- coding:utf-8 -*-
#! /usr/bin/python
import urllib
import os,datetime,sys
from bs4 import BeautifulSoup
reload(sys) 
sys.setdefaultencoding( "utf-8" ) 
__BASEURL__ = "http://bj.58.com/"
__INITURL__ = "http://bj.58.com/hezu/"
soup=BeautifulSoup(urllib.urlopen(__INITURL__))
lv1Elements = soup.html.body.section.find('div','relative').find('dl','secitem')('a',href=True)
f=open('data.txt','w')
for element in lv1Elements[1:]:
  f.write((element.get_text() + 'rn'))
  print element.get_text()
  url = __BASEURL__ + element.get('href')
  print url
  soup=BeautifulSoup(urllib.urlopen(url))
  lv2Elements = soup.html.body.section.find('div','secitem').find('div','subarea').find_all('a')
  texts = [t.get_text() for t in lv2Elements]
  f.write(' '.join(texts) + 'rnrn')
f.close()