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I am testing against the following test document:
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>hi there</title> </head> <body> <img class="foo" src="bar.png"/> </body> </html> If I parse the document using lxml.html, I can get the IMG with an xpath just fine:
>>> root = lxml.html.fromstring(doc) >>> root.xpath("//img") [<Element img at 1879e30>] However, if I parse the document as XML and try to get the IMG tag, I get an empty result:
>>> tree = etree.parse(StringIO(doc)) >>> tree.getroot().xpath("//img") [] I can navigate to the element directly:
>>> tree.getroot().getchildren()[1].getchildren()[0] <Element {http://www.w3.org/1999/xhtml}img at f56810> But of course that doesn't help me process arbitrary documents. I would also expect to be able to query etree to get an xpath expression that will directly identify this element, which, technically I can do:
>>> tree.getpath(tree.getroot().getchildren()[1].getchildren()[0]) '/*/*[2]/*' >>> tree.getroot().xpath('/*/*[2]/*') [<Element {http://www.w3.org/1999/xhtml}img at fa1750>] But that xpath is, again, obviously not useful for parsing arbitrary documents.
Obviously I am missing some key issue here, but I don't know what it is. My best guess is that it has something to do with namespaces but the only namespace defined is the default and I don't know what else I might need to consider in regards to namespaces.
So, what am I missing?
235
The problem is the namespaces. When parsed as XML, the img tag is in the http://www.w3.org/1999/xhtml namespace since that is the default namespace for the element. You are asking for the img tag in no namespace.
Try this:
>>> tree.getroot().xpath( ... "//xhtml:img", ... namespaces={'xhtml':'http://www.w3.org/1999/xhtml'} ... ) [<Element {http://www.w3.org/1999/xhtml}img at 11a29e0>] If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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