python - 无法使用 lxml Xpath 解析器解析 html

Question

我正在尝试解析此页面的评论:http://www.amazon.co.uk/product-reviews/B00143ZBHY

使用以下方法:

代码

html # a variable which contains exact html as given at the above page.
from lxml import etree
tree = etree.HTML(html)
r = tree.xpath(".//*[@id='productReviews']/tbody/tr/td[1]/div[9]/text()[4]")
print len(r)
print r[0].tag

输出

0
Traceback (most recent call last):
  File "c.py", line 37, in <module>
    print r[0].tag
IndexError: list index out of range

p,s,: 当在 firefox 的 xpath 检查器插件上使用相同的 xpath 时，我可以很容易地做到这一点。但是这里没有结果，请帮助!

Answer 1

尝试删除 /tbody形式 XPath — 没有 <tbody>在#productReviews .

import urllib2
html = urllib2.urlopen("http://www.amazon.co.uk/product-reviews/B00143ZBHY").read()
from lxml import etree
tree = etree.HTML(html)
r = tree.xpath(".//*[@id='productReviews']/tr/td[1]/div[9]/text()[4]")
print r[0]

输出:

bought this as replacement for the original cover which came with my greenhouse and which ripped in the wind.  so far this seems a good replacement although for some reason it seems slightly too small for my greenhouse so that i cant zip both sides of the front at the same time.  seems sturdier and thicker than the cover i had before so hoping it lasts a bit longer!