Python实现抓取网页并且解析的实例

本文以实例形式讲述了Python实现抓取网页并解析的功能。主要解析问答与百度的首页。分享给大家供大家参考之用。

主要功能代码如下：

#!/usr/bin/python
#coding=utf-8

import sys
import re
import urllib2
from urllib import urlencode
from urllib import quote
import time
maxline = 2000

wenda = re.compile("href=\"http://wenda.so.com/q/.+\?src=(.+?)\"")
baidu = re.compile("<a href=\"http://www.baidu.com/link\?url=.+\".*?>更多知道相关问题.*?</a>")
f1 = open("baidupage.txt","w")
f2 = open("wendapage.txt","w")

for line in sys.stdin:
 if maxline == 0:
   break
 query = line.strip();
 time.sleep(1);
 recall_url = "http://www.so.com/s?&q=" + query;
 response = urllib2.urlopen(recall_url);
 html = response.read();                                                  
 f1.write(html)
 m = wenda.search(html);
 if m:
   if m.group(1) == "110":
     print query + "\twenda\t0";
   else:
     print query + "\twenda\t1";
 else:
   print query + "\twenda\t0";
 recall_url = "http://www.baidu.com/s?wd=" + query +"&ie=utf-8";
 response = urllib2.urlopen(recall_url);
 html = response.read();
 f2.write(html)
 m = baidu.search(html);
 if m:
   print query + "\tbaidu\t1";
 else:
   print query + "\tbaidu\t0";
 maxline = maxline - 1;
f1.close()
f2.close()

希望本文所述对大家Python程序设计的学习有所帮助。