Python抓取百度查询结果的方法

#win python 2.7.x
import re,sys,urllib,codecs
xh = urllib.urlopen("http://www.baidu.com/s").read().decode('utf-8') 
rc = re.compile(r'<td class=f><h3 class="t"><a.*?>("xiaohei.txt", "w", "utf-8")
for i in rc.finditer(xh):
  ss = i.group(0)
  s1 = rcr.sub('',ss)
  print (s1)
  f.write(s1)
f.close()