Scraping web content using xpath won't work

问题

I'm using xpath to scrape a amazon webpage particular, but it doesn't work. Can any one give me some advice? Here's the link to that page: a link

I want to scrape these: "Fun, credit card-sized prints" The code i'm using is here:

from lxml import html
import requests

url = 'http://www.amazon.co.uk/dp/B009CX5VN2'
page = requests.get(url)
tree = html.fromstring(page.text)
feature_bullets = tree.xpath('//*[@id="feature-bullets"]/ul/li[1]/span/text()')

But the feature_bullets is always empty. Really need some help.

回答1:

The HTML that I download doesn't match your expectations. Here is the expression that works for me:

tree.xpath('//div[@id="technicalProductFeaturesATF"]/ul/li[1]/text()')

Complete program:

from lxml import html
import requests
from pprint import pprint

url = 'http://www.amazon.co.uk/dp/B009CX5VN2'
page = requests.get(url)
tree = html.fromstring(page.text)
feature_bullets = tree.xpath('//div[@id="technicalProductFeaturesATF"]/ul/li/text()')

pprint(feature_bullets)

Result:

$ python foo.py 
['Fun, credit card-sized prints',
 'LCD film counter and shooting mode display',
 'Camera mounted mirror for self portraits',
 'Powered by CR2 Batteries, Built-in, Automatic electronic flash',
 'Fujifilm Instax Mini 25 + 30 Instax Mini Film']

来源：https://stackoverflow.com/questions/25063774/scraping-web-content-using-xpath-wont-work