|  | python/xpath question.. | | |
| | | bruce |  |
|  Posted: Wed Sep 03, 2008 6:36 pm Post subject: python/xpath question.. |  |
morning....
i apologize up front as this is really more of an xpath question..
in my python, i'm using the xpath function to iterate/parse some html. i can
do something like
s=d.xpath("//tr/td/text()")
count=len(s)
and get the number of nodes that have text
i can then do something like
s=d.xpath("//tr/td")
count2=len(s)
and get the number of total nodes...
by subtracting, i can get the number of nodes, without text.. is there an
easier way??!!
count2-count
ie, if i have something like
<tr>
<td></td>
<td>foo</td>
</tr>
is there a way to get the count that there is a single "td" node with
text()=""
thanks |
| |
| | | John Krukoff | |
| | Posted: Wed Sep 03, 2008 8:14 pm Post subject: Re: python/xpath question.. | |
| |  | |
On Wed, 2008-09-03 at 13:36 -0700, bruce wrote:
| Quote: | morning....
i apologize up front as this is really more of an xpath question..
in my python, i'm using the xpath function to iterate/parse some html. i can
do something like
s=d.xpath("//tr/td/text()")
count=len(s)
and get the number of nodes that have text
i can then do something like
s=d.xpath("//tr/td")
count2=len(s)
and get the number of total nodes...
by subtracting, i can get the number of nodes, without text.. is there an
easier way??!!
count2-count
ie, if i have something like
tr
td></td
td>foo</td
/tr
is there a way to get the count that there is a single "td" node with
text()=""
thanks
--
LINK
|
Well, you could just do the test (and the count!) in the xpath
expression:
count( //tr/td[ text() != "" ] )
It sounds like you're not familiar with xpath? I would recommend the
O'Reilly XSLT book, it has an excellent introduction to xpath in chapter
3.
--
John Krukoff <jkrukoff@ltgc.com>
Land Title Guarantee Company |
| |
| | | Stefan Behnel | |
| | Posted: Thu Sep 04, 2008 5:12 am Post subject: Re: python/xpath question.. | |
Hi,
you should really read about XPath. There are also newsgroups specifically for
this topic, please use them.
bruce wrote:
| Quote: | in my python, i'm using the xpath function to iterate/parse some html. i can
do something like
s=d.xpath("//tr/td/text()")
count=len(s)
and get the number of nodes that have text
|
That is a wrong assumption. It will give you the number of text nodes, not the
number of elements. They may or may not be the same.
| Quote: | i can then do something like
s=d.xpath("//tr/td")
count2=len(s)
and get the number of total nodes...
by subtracting, i can get the number of nodes, without text.. is there an
easier way??!!
|
Yes, learn to use XPath, e.g.
//tr/td[not string()]
Stefan |
| |
|
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