Mailman 3 May 2015 - lxml - The Python XML Toolkit

[lxml-dev] lxml has its page on launchpad
by Stefan Behnel 10 Apr '23

10 Apr '23

Hi all, I added the lxml project to launchpad, the Ubuntu Bug-Tracker. It also has a FAQ engine and a couple of other goodies. https://launchpad.net/lxml It's easy to sign up for launchpad, BTW, no 90%-footnotes-contract. Have fun, Stefan

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[lxml-dev] Checking whether a node is a comment/element
by Geoffrey Sneddon 09 Apr '23

09 Apr '23

Hi, What's the best way to check whether a given node is a comment or an element? For the former, I'm currently using isinstance(node, etree._Comment), which is rather obviously sub-optimal. -- Geoffrey Sneddon <http://gsnedders.com/>

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[lxml-dev] Reparenting a node
by Lawrence Oluyede 30 Jan '23

30 Jan '23

I have a doc A and a doc B, I'd like to put a node extracted from A in the document B but I always get a ValueError: ValueError: Element is not a child of this node. I didn't find any "setparent" in the API. How can I do this? -- Lawrence, oluyede.org - neropercaso.it "It is difficult to get a man to understand something when his salary depends on not understanding it" - Upton Sinclair

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[lxml-dev] lxml 2.0.5 released
by Stefan Behnel 11 Jan '23

11 Jan '23

Hi all, lxml 2.0.5 is on PyPI. This is a bug-fix-only release of the stable 2.0 series. Have fun, Stefan 2.0.5 (2008-05-01) Bugs fixed * Resolving to a filename in custom resolvers didn't work. * lxml did not honour libxslt's second error state "STOPPED", which let some XSLT errors pass silently. * Memory leak in Schematron with libxml2 >= 2.6.31.

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[lxml-dev] Building LXML Trunk
by Sidnei da Silva 30 Aug '22

30 Aug '22

Hi, I've tried to build lxml from trunk today, on Win32. Got the following error: src\lxml\etree.c(880) : error C2059: syntax error : ')' src\lxml\etree.c(881) : error C2059: syntax error : ')' src\lxml\etree.c(882) : error C2059: syntax error : ')' src\lxml\etree.c(883) : error C2059: syntax error : ')' Any clue? Smells like a Pyrex issue? -- Sidnei da Silva Enfold Systems http://enfoldsystems.com Fax +1 832 201 8856 Office +1 713 942 2377 Ext 214

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Problem when writing source tag in HTML5 video tag
by Felix Fontein 29 May '15

29 May '15

Hi everyone! I'm using lxml.html to read and write a HTML5 file. Now I noticed that if the HTML5 file contains a <video> element which contains a <source> element, when writing the file back a </source> is generated which shouldn't be there. Minimal example: ---------8<---------8<---------8<---------8<---------8<--------- import lxml.html data = """<!DOCTYPE html> <html> <head> <title>1</title> </head> <body> <video> <source src="1.ogv" type="video/ogg"> </video> </body> </html>""" parser = lxml.html.HTMLParser() doc = lxml.html.document_fromstring(data, parser) data = b'<!DOCTYPE html>\n' + lxml.html.tostring(doc) result = data.decode('utf-8') assert result == """<!DOCTYPE html> <html> <head> <title>1</title> </head> <body> <video> <source src="1.ogv" type="video/ogg"> </source></video> </body> </html>""" ---------8<---------8<---------8<---------8<---------8<--------- Am I doing something wrong? Or how can I get rid of </source>? I also tried using lxml's html5parser, but lxml.html.tostring() also produced a </source> tag (and there was a "html:" namespace in every tag). Thanks a lot and best regards, Felix -- Felix Fontein -- felix(a)fontein.de -- https://felix.fontein.de/

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Parsing iframe leading text error
by prakhar joshi 22 May '15

22 May '15

Hello everyone, I have been using lxml and I have to parse iframe ( http://pastie.org/10203277 ) tag with leading text and when I am doing so I am getting an error http://pastie.org/10203259 . So I want the out put as it is as input (html) so can anyone help me with this error as I can't find the proper way in docs. Thanks for your guidance. Cheers!! Prakhar Joshi DA-IICT,Gandhinagar

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Line Number of a Start Tag
by Thomas Schraitle 21 May '15

21 May '15

Hi, assume I have the following Python 3 code: ------------------------------ import io from lxml import etree source = """<?xml version="1.0"?> <article version="5.0" xml:lang="en" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink"> <title>...</title> <para>...</para> </article> """ tree = etree.parse(io.StringIO(source)) root = tree.getroot() print(root.sourceline) ------------------------------ When I run the above code, I get "4" as a result. This is a bit unexpected. It seems, root.sourceline returns the line number where the start tag _ends_. However, I need to get the line number where <article> _starts_ (here in this example "2"). How can I get the "starting" line number of a start tag? Thanks! -- Gruß/Regards, Thomas Schraitle

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cleanup namespaces and XML elements with QNames
by Tom Kralidis 15 May '15

15 May '15

Hi: using lxml 3.3.5, we have XML documents with elements having QName type values. We would like to implement etree.cleanup_namespaces but are finding that this affects downstream parsers/validators complaining about undeclared namespace prefixes. Below is an isolated example: from lxml import etree nsmap = { 'ogc': 'http://www.opengis.net/ogc', 'ows': 'http://www.opengis.net/ows', 'gml': 'http://www.opengis.net/gml' } root = etree.Element('{http://www.opengis.net/ogc}Filter', nsmap=nsmap) typename = etree.SubElement(root, '{http://www.opengis.net/ogc}typeName') typename.text = etree.QName('http://www.opengis.net/gml', 'Envelope') typename2 = etree.SubElement(root, '{http://www.opengis.net/ogc}typeName') typename2.text = etree.QName('{http://www.opengis.net/gml}Envelope') print etree.tostring(root, pretty_print=True) etree.cleanup_namespaces(root) print etree.tostring(root, pretty_print=True) Here we would like the gml namespace declaration, but it looks like cleanup_namespaces is throwing out namespace declarations even if they apply to element content. Are there any workarounds we can use/implement to cleanup unused namespaces while preserving those for element content per above? Thanks in advance. ..Tom

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XSLT extension: process_children
by Jens Tröger 10 May '15

10 May '15

Hi, I am trying to understand the process_children() function. If in my extension is have def execute(self, context, self_node, input_node, output_parent): self.process_children(context, output_parent) then processing works just fine (although I haven't done anything with the output here). However, using def execute(self, context, self_node, input_node, output_parent): x = self.process_children(context, output_parent=None) output_parent.append(x) crashes: x = self.process_children(context, output_parent=None) File "xsltext.pxi", line 111, in lxml.etree.XSLTExtension.process_children (src/lxml/lxml.etree.c:164356) File "readonlytree.pxi", line 550, in lxml.etree._nonRoNodeOf (src/lxml/lxml.etree.c:78766) TypeError: invalid argument type <class 'NoneType'> although I had assumed the two to be synonymous. I ask because I want to inject my own node and dangle children off of my own node like this: p = lxml.etree.Element("p") p.attrib["style"] = "..." output_parent.append(p) self.process_children(context, p) but that, too, fails. What am I doing wrong here? Thanks! Jens -- Jens Tröger http://savage.light-speed.de/

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