Diez B. Roggisch
deets at nospam.web.de
Mon Feb 16 20:03:45 CET 2009
> using libxml2dom as the xpath lib
> i've got a situation where i can have:
> foo=a.xpath( /html/body/table/tr/td)
> and i can get
> 11 as the number of returned td elements for the 45th row...
> this is as it should be.
> however, if i do:
> foo=a.xpath( /html/body/table/tr)
> and then try to iterate through to the 45th "tr", and try to get the number
> of "td" elements..
> i can't seem to get the additional xpath that has to be used,
> i've tried a number of the following with no luck...
> l1 = libxml2dom.toString(tmp_)
> print "l1 = "+l1+"\n"
> ldx = 0
> for l in tmp_:
> print "ld ="+str(ldx)
> if ldx==45:
> #needs to be a better way...
> #l1 = libxml2dom.toString(tmp_)
> l1 = libxml2dom.toString(l)
> #print "1111 = ",l1
> q1 = libxml2dom
> b1 = q1.parseString(l1, html=1)
> #dd1 = b1.xpath("//td[not(@width)]")
> #data = b1.xpath("//td/font")
> #data = b1.xpath("//td[@valign='top'][not(@width)]")
> #data =
> #data = b1.xpath("//td/parent::*/td[@valign='top'][not(@width)]")
> #data = b1.xpath("//td[position()]")
> #data = b1.xpath("//parent::tr[position()=1]/td")
> data = b1.xpath("//td[@valign='top'][not(@width)]")
> it appears that i somehow need to get the direct child/node of the parent
> "tr" that's the "td"...
> it looks like using ("//td..." gets all the underlying child "td"... as
> opposed to the direct
> 1st level child/siblings... any thoughts/pointers would be appreciated...
- you don't give enough information, as you don't provide the html
- the above code is obviously not the one running, as I can't see
anything that's increasing your running variable ldx
- using l as variable names is extremely confusing, because it's hard
to distinguish from 1 (the number). Using l1 is even worse.
- xpath usually counts from 1, whereas python is 0-based. As is your
code. So you most probably have a off-by-one-error.
- you should read a xpath-tutorial, as "//td"'s purpose is to fetch
*all* elements td from the document root, as it is clearly stated here:
http://www.w3.org/TR/xpath#path-abbrev. So it's no wonder you get more
than you expect. Direct child nodes are found by simply omitting the
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