如何通过使用lxml.etree python中的类名来解析html

Question

req = requests.get(url)
tree = etree.HTML(req.text)

now instead of using xpath tree.xpath(...) I would like to know if we can search by class name of id as we do in beautifulSoup soup.find('div',attrs={'class':'myclass'}) I'm looking for something similar in lxml.

Answer 1

The far more concise way to do that in bs4 is to use a css selector:

soup.select('div.myclass') #  == soup.find_all('div',attrs={'class':'myclass'})

lxml provides cssselect as a module (which actually compiles XPath expressions ) and as a convenience method on Element objects.

import lxml.html

tree = lxml.html.fromstring(req.text)
for div in tree.cssselect('div.myclass'):
    #stuff

Or optionally you can pre-compile the expression and apply that to your Element :

from lxml.cssselect import CSSSelector
selector = CSSSelector('div.myclass')

selection = selector(tree)

Answer 2

You say that you don't want to use xpath but don't explain why. If the goal is to search for a tag with a given class, you can do that easily with xpath.

For example, to find a div with the class "foo" you could do something like this:

tree.find("//div[@class='foo']")