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27974
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0
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2008-08-26T13:06:39.587
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2016-02-07T18:16:49.647
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2016-02-07T18:16:49.647
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2921691
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620
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8692
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2
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116
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text
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<a href="http://xmlsoft.org/python.html" rel="noreferrer">libxml2</a> has a number of advantages: <ol> <li>Compliance to the <a href="http://www.w3.org/TR/xpath" rel="noreferrer">spec</a></li> <li>Active development and a community participation </li> <li>Speed. This is really a python wrapper around a C implementation. </li> <li>Ubiquity. The libxml2 library is pervasive and thus well tested.</li> </ol> Downsides include: <ol> <li>Compliance to the <a href="http://www.w3.org/TR/xpath" rel="noreferrer">spec</a>. It's strict. Things like default namespace handling are easier in other libraries.</li> <li>Use of native code. This can be a pain depending on your how your application is distributed / deployed. RPMs are available that ease some of this pain.</li> <li>Manual resource handling. Note in the sample below the calls to freeDoc() and xpathFreeContext(). This is not very Pythonic.</li> </ol> If you are doing simple path selection, stick with <a href="http://effbot.org/zone/element-xpath.htm" rel="noreferrer">ElementTree</a> ( which is included in Python 2.5 ). If you need full spec compliance or raw speed and can cope with the distribution of native code, go with libxml2. Sample of libxml2 XPath Use <hr> <pre><code>import libxml2 doc = libxml2.parseFile("tst.xml") ctxt = doc.xpathNewContext() res = ctxt.xpathEval("//*") if len(res) != 2: print "xpath query: wrong node set size" sys.exit(1) if res[0].name != "doc" or res[1].name != "foo": print "xpath query: wrong node set value" sys.exit(1) doc.freeDoc() ctxt.xpathFreeContext() </code></pre> Sample of ElementTree XPath Use <hr> <pre><code>from elementtree.ElementTree import ElementTree mydoc = ElementTree(file='tst.xml') for e in mydoc.findall('/foo/bar'): print e.get('title').text</code></pre> <hr>
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1. POHow to use Xpath in Python?
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