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Capturing the <title> tag with lxml iterparse

I am having a problem using lxml iterparsein my HTML. I am trying to get text <title>, but this simple function does not work on full web pages:

def get_title(str):
    titleIter = etree.iterparse(StringIO(str), tag="title")
    try:
        for event, element in titleIter:
            return element.text
        # print "Script goes here when it doesn't work"
    except etree.XMLSyntaxError:
        return None

This function works great with simple input like " <title>test</title>", but when I give it a full page, it cannot extract the title.

UPDATE: here is the HTML I'm working with:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html dir="ltr" lang="it" xmlns="http://www.w3.org/1999/xhtml">
<head>
<link rel="icon" href="http://www.tricommerce.it/tricommerce.ico" />
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Tricommerce - Informazioni sulla privacy</title>
<meta name="description" content="Info sulla privacy" />
<meta name="keywords" content="Accessori notebook Alimentatori Case Cavi e replicatori Controllo ventole Lettori e masterizzatori Modding Pannelli &amp; display Dissipatori Tastiere e mouse Ventole Griglie e filtri Hardware Accessori vari Box esterni Casse e cuffie Sistemi a liquido Paste termiche vendita modding thermaltake vantec vantecusa sunmbeam sunbeamtech overclock thermalright xmod aerocool arctic cooling arctic silver zalman colorsit colors-it sharkoon mitron acmecom Info sulla privacy" />
<meta name="robots" content="index, follow" />
<link rel="stylesheet" href="http://www.tricommerce.it/css/tricommerce.css" />
<link rel="stylesheet" href="css/static.css" />
<script type="text/javascript" src="http://www.tricommerce.it/javascript/vertical_scroll.js"></script>

<script type="text/javascript">
//<![CDATA[
function MM_preloadImages() { //v3.0
 var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
   var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
   if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}
//]]>
</script>

<link rel="stylesheet" type="text/css" href="http://www.tricommerce.it/css/chromestyle.css" />

<script type="text/javascript" src="http://www.tricommerce.it/javascript/chrome.js">
/***********************************************
* AnyLink CSS Menu script- ? Dynamic Drive DHTML code library (www.dynamicdrive.com)
* This notice MUST stay intact for legal use
* Visit Dynamic Drive at http://www.dynamicdrive.com/ for full source code
***********************************************/
</script>

</head>
</html>

In addition, a short remark about why I use iterparse is because I do not want to load into the entire DOM in order to immediately get one tag in the document.

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1 answer

, , . , . <html> XML , . , :

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://www.w3.org/MarkUp/SCHEMA/xhtml11.xsd"
  xml:lang="en">
  <head>            
    <title>Document Title</title>
  </head>
  <body>
  </body>
</html>

, :

>>> doc = etree.parse(open('foo.html'))
>>> doc.xpath('//title')
[]

, <title> ... , ( foo:title bar:title, , foo: bar: XML ).

ElementTree, :

>>> doc.xpath('//html:title',
...   namespaces={'html': 'http://www.w3.org/1999/xhtml'})
[<Element {http://www.w3.org/1999/xhtml}title at 0x1087910>]

.

tag iterparse:

>>> titleIter = etree.iterparse(StringIO(str), 
...   tag='{http://www.w3.org/1999/xhtml}title')
>>> list(titleIter)
[(u'end', <Element {http://www.w3.org/1999/xhtml}title at 0x7fddb7c4b8c0>)]

, , .

+2

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