python分析网页上所有超链接的方法

import urllib, htmllib, formatter
website = urllib.urlopen("http://yourweb.com")
data = website.read()
website.close()
format = formatter.AbstractFormatter(formatter.NullWriter())
ptext = htmllib.HTMLParser(format)
ptext.feed(data)
for link in ptext.anchorlist:
  print(link)