Non in grado di analizzare HTML usando lxml Xpath parser

Question

sto cercando di analizzare recensione da questa pagina: http://www.amazon.co.uk/product-reviews/B00143ZBHY

Utilizzando seguente approccio:

Codice

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 

uscita

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 ,: Mentre si utilizza lo stesso xpath su xpath checker addon di firefox, sono in grado di farlo facilmente. Ma nessun risultato qui, per favore aiuto!

Answer 1

Provare a rimuovere /tbody modulo XPath - non c'è <tbody> in .

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] 

uscita:.

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