# coding:utf8

import urllib2

class HtmlDownloder(object):

    def download(self, url):

        if url is None:

            return None

        response = urllib2.urlopen(url)

        if response.getcode() != 200:

            return None

        html = response.read()

        print html

        return html

解析地址：https://baike.baidu.com/item/Python/407313?fr=aladdin