比如要獲取所有class=test的div元素，

1. 用Scrapy，示範程式碼：

    def parse(self, response):
        hxs = Selector(response)
        items = []

        divs = hxs.xpath('//div[@class="test"]')

from lxml import etree
#import mechanize
import lxml.html
#import cookielib

#br = mechanize.Browser()
#r = br.open('http://yourdomain.com')
#html = br.response().read()
#root = lxml.html.fromstring(html)
#divs = root.xpath("//div[@class='test']")
hparser = etree.HTMLParser(encoding='utf-8') #for avoiding unicode codec problems
htree = etree.parse('http://yourdomain.com',hparser)
htree.write('/tmp/bi.html') 
divs= htree.xpath("//div[@class='test']")
 

把上述xpath的引數修改為 "div[contains(@class,'test')]" 即可。

Scrapy內部解析引擎也是用的lxml。

參考連結：

by iefreer