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Date: Fri, 22 Feb 2013 14:16:54 +0100
From: Philipp Hagemeister <phihag@phihag.de>
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To: python <mailtomanage@163.com>
Subject: Re: Issues a longer xpath expression
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Hi anonymous,

your code is working perfectly right. It's just that the only time that
you find anything matching //div[@class=3D"col f-cb"] is this one:

<div class=3D"col f-cb">
    <div class=3D"name s-fc3 f-fl">=E5=90=8D=E7=A7=B0</div>
    <div class=3D"down s-fc3 f-fl">=E8=A7=86=E9=A2=91=E4=B8=8B=E8=BD=BD</=
div>
    <div class=3D"desc s-fc3 f-fl">=E8=AF=BE=E7=A8=8B=E7=AE=80=E4=BB=8B</=
div>
</div>

And obviously, there's no <a> in there, so the xpath won't match.

Cheers,

Philipp

On 02/22/2013 02:24 AM, python wrote:
> I am having issues with the urllib and lxml.html modules.
>=20
> Here is my original code:
>=20
> import urllib =20
> import lxml.html =20
> down=3D'http://v.163.com/special/visualizingdata/' =20
> file=3Durllib.urlopen(down).read() =20
> root=3Dlxml.html.document_fromstring(file)
> xpath_str=3D"//div[@class=3D'down s-fc3 f-fl']/a" =20
> urllist=3Droot.xpath(xpath_str)for url in urllist:print url.get("href")=

>=20
> When run, it returns this output:
>=20
> http://mov.bn.netease.com/movieMP4/2012/12/A/7/S8H1TH9A7.mp4 =20
> http://mov.bn.netease.com/movieMP4/2012/12/D/9/S8H1ULCD9.mp4 =20
> http://mov.bn.netease.com/movieMP4/2012/12/4/P/S8H1UUH4P.mp4 =20
> http://mov.bn.netease.com/movieMP4/2012/12/B/V/S8H1V8RBV.mp4 =20
> http://mov.bn.netease.com/movieMP4/2012/12/6/E/S8H1VIF6E.mp4 =20
> http://mov.bn.netease.com/movieMP4/2012/12/B/G/S8H1VQ2BG.mp4 =20
>=20
> But, when I change the line
>=20
> xpath_str=3D'//div[@class=3D"down s-fc3 f-fl"]//a'
>=20
> into
>=20
> xpath_str=3D'//div[@class=3D"col f-cb"]//div[@class=3D"down s-fc3 f-fl"=
]//a'
>=20
> that is to say,
>=20
> urllist=3Droot.xpath('//div[@class=3D"col f-cb"]//div[@class=3D"down s-=
fc3 f-fl"]//a')
>=20
> I do not receive any output. What is the flaw in this code?
> it is so strange that the shorter one can work,the longer one can not,t=
hey have the same xpath structure!
>=20
>=20
>=20



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