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-8import sys import reimport urllib2from urllib import urlencodefrom urllib import quoteimport timemaxline = 2000wenda = 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/sq=" + 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/swd=" + 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。