suppose that i have this xml file :

<article-set xmlns:ns0="http://casfwcewf.xsd" format-version="5">
<article><article id="11234"><source><hostname>some hostname for 11234</hostname></source><feed><type weight=0.32>RSS</type></feed><uri>some uri for 11234</uri></article><article id="63563"><source><hostname>some hostname for 63563 </hostname></source><feed><type weight=0.86>RSS</type></feed><uri>some uri  for 63563</uri></article>
.
.
.
</article></article-set>

what I want, is to print each article id with its specific attribute weight in RSS for the whole document (like this).

id=11234 
weight= 0.32id=63563 
weight= 0.86
.
.
.

I used this code to do so,

from lxml import etree
tree = etree.parse("C:\\Users\\Me\\Desktop\\public.xml")for article in tree.iter('article'):article_id = article.attrib.get('id')for weight in tree.xpath("//article[@id={}]/feed/type/@weight".format(article_id)):print(article_id,weight)

and it did not work, could someone help me with this?

You can do it in two lines if you really want to do so.

>>> from lxml import etree
>>> tree = etree.parse('public.xml')
>>> for item in tree.xpath('.//article[@id]//type[@weight]'):
...     item.xpath('../..')[0].attrib['id'], item.attrib['weight']
... 
('11234', '0.32')
('63563', '0.86')

One xml checker I used insisted on double-quotes around the values for weight. etree croaked on the xml until I dropped the first line in the file; I don't know why.