使用HTMLParser从页面中提取绝对链接

Question

我正在使用以下代码段来提取页面上的所有链接HTMLParser.我得到了不少相对网址.如何将这些转换为域的绝对URL,例如www.exmaple.com

import htmllib, formatter
import urllib, htmllib, formatter

class LinksExtractor(htmllib.HTMLParser):

   def __init__(self, formatter):
      htmllib.HTMLParser.__init__(self, formatter)
      self.links = []

   def start_a(self, attrs):
      if len(attrs) > 0 :
         for attr in attrs :
            if attr[0] == "href":
                self.links.append(attr[1])

   def get_links(self):
      return self.links


format = formatter.NullFormatter()
htmlparser = LinksExtractor(format)

data = urllib.urlopen("http://cis.poly.edu/index.htm")
htmlparser.feed(data.read())
htmlparser.close()

links = htmlparser.get_links()
print links

谢谢

Answer 1

你要

urlparse.urljoin(base, url[, allow_fragments])

http://docs.python.org/library/urlparse.html#urlparse.urljoin

这允许您提供绝对或基本URL,并将其与相对URL连接.即使它们有重叠的部分,也应该有效.