無法使用lxml的Xpath的解析器

Question

我想從這個頁面解析審查，以解析HTML：http://www.amazon.co.uk/product-reviews/B00143ZBHY

使用以下方法：

代碼

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 

輸出

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 ,:在Firefox的xpath檢查器插件上使用相同的xpath時，我可以輕鬆地解決它。但這裏沒有結果，請幫忙！

Answer 1

嘗試從表中刪除/tbody XPath - 在#productReviews中沒有<tbody>。

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] 

輸出：

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!