Re: [lxml] Xpath, span control and iterate inside xpath result.

Nov. 5, 2013

      Année 2013, mardi 05 novembre, vers 18:02, Holger Joukl écrivait:
...
Hi,
Hello Holger,
...
"lxml" <lxml-bounces@lxml.de> schrieb am 05.11.2013 17:00:48:
...
...
...
Problem 2: I want also to extract "Some texttext" just after the span
class. Then, I have to trigger an event in an SAX like method. If you
agree with with how I could do such trick if I am already working in
the
TREE.xpath('/html/body/table') ?
Again, multiple ways to do it.
I was thinking about this one:
...
Or iterate over the children
until you find the right <br> and read its tail.
But what is the syntaxe with the example I gave you ?
(Sorry but I better understand now thanks to your example with the exact
syntaxe)
Already delete your original mail but this might get you going:
...
...
...
tree = etree.fromstring('<root><mixed>mixed text<x>x text</x>x
tail</mixed></root>')
print etree.tostring(tree, pretty_print=True)
<root>
  <mixed>mixed text<x>x text</x>x tail</mixed>
</root>
...
...
...
for elem in tree.iter():
...     if elem.tail: # use appropriate condition here to select your
elements
...         print elem, elem.tail
...
<Element x at 0x3a2d78> x tail
Thanks, 
then I could trigger an event with elem.tag but I started the
script like this:

file = "file.html"
parser = etree.HTMLParser()
tree = etree.parser(file, parser)

And I started to navigate inside the file with xpath:
for document in tree.xpath('/html/body/table'):
    [...]
    for data in document.xpath("./tr/td/")
	    ... here are my data after <br><br>

Then I am looking for something like data.iter() from xpath result, but
it is not possible.

How to get a tree (not fromstring) but from where I am during the
parsing ?
--
Alexandre

Here is a copy of precedent mail if needed:

Date: Tue, 05 Nov 2013 13:50:10 +0100
From: Stefan Behnel <stefan_ml@behnel.de>
To: lxml mailing list <lxml@lxml.de>
Subject: Re: [lxml] Xpath, span control and iterate inside xpath result.
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101
 Thunderbird/24.1.0

Alexandre Delanoë, 05.11.2013 13:19:
...
Hello and many thanks for lxml module!
I am discovering its capabilities but I can hardly end up my first
parser, because of 2 issues.
First, I have a valid file.html to parse, here is an example:
<html>
  <body>
      <tbody>
      <tr>
      <td>
      <table id="tbHeaderImages">
      	<span class="Title">
      	BLO BLO
      	<span style="color:red; font-weight:bold">BLU BLU</span>
      	BLA BLA
      	</span>
      <br>
      <br>
      Some texttext
      <br>
      ...
      </table>
      </tbody>
  </body>
</html>
I have many documents each inside table:
for document in TREE.xpath('/html/body/table'):
Then, I want to extract each title:
title = document.xpath("./tr/td/span[@class = 'Title']/text()")
Problem 1: I get "BLO BLO" and "BLA BLA" whereas I would like 
"BLO BLO" and "BLU BLU" and "BLA BLA".
You could try either of the following:

  title = document.xpath("./tr/td/span[@class = 'Title']//text()")

  title = document.xpath("string(./tr/td/span[@class = 'Title'])")

or even

  text = etree.tostring(
       document.xpath("./tr/td/span[@class = 'Title']")[0],
       method='text')

depending on what exactly you want as a result.
...
Problem 2: I want also to extract "Some texttext" just after the span
class. Then, I have to trigger an event in an SAX like method. If you
agree with with how I could do such trick if I am already working in the
TREE.xpath('/html/body/table') ?
Again, multiple ways to do it. You could delete the <span> tag and then
serialise the table as text, for example. Or iterate over the children
until you find the right <br> and read its tail.

Stefan

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