Mailman 3 April 2018 - lxml - The Python XML Toolkit

[lxml-dev] lxml has its page on launchpad
by Stefan Behnel 11 Apr '23

11 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 10 Apr '23

10 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 31 Aug '22

31 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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What is the formal definition of ElementPath language?
by Peng Yu 29 Apr '18

29 Apr '18

Hi, http://lxml.de/tutorial.html The above URL says. But it is not clear what is ElementPath language and how it is different from XPath. Could anybody show me where the formal definition of ElementPath language is? Thanks. `lxml.etree` supports the ElementPath language ... -- Regards, Peng

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ElementPath vs. XPath expression
by Jens Tröger 22 Apr '18

22 Apr '18

Hello, I’m trying to select the last child of an element. However, I noticed the following with lxml 4.1.1 last = el.find("./*[last()]") returns the first child. last, *_ = el.xpath("./*[last()]") returns the last child. According to the documentation: http://effbot.org/zone/element-xpath.htm both should work though. Also, just out of curiosity, would the following have any advantage (perf?) over the above? *_, last = list(el) Thanks! Jens -- Jens Tröger http://savage.light-speed.de/

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What is the difference between lxml.etree._ElementTree and lxml.etree._Element?
by Peng Yu 18 Apr '18

18 Apr '18

Hi, I can not tell the difference between lxml.etree._ElementTree and lxml.etree._Element. Could anybody explain what is the difference between them? Thanks. $ ./main.py bar <<< '<foo><x><bar>abc</bar></x><bar>xyz</bar></foo>' <type 'lxml.etree._ElementTree'> ['<bar>xyz</bar>'] <type 'lxml.etree._Element'> ['<bar>xyz</bar>'] $ cat main.py #!/usr/bin/env python # vim: set noexpandtab tabstop=2 shiftwidth=2 softtabstop=-1 fileencoding=utf-8: from lxml import etree import sys tree = etree.parse(sys.stdin) print type(tree) print [etree.tostring(x) for x in tree.iterfind(sys.argv[1])] r = tree.xpath('/foo') print type(r[0]) print [etree.tostring(x) for x in r[0].iterfind(sys.argv[1])] -- Regards, Peng

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How to extract tags with ":" in it?
by Peng Yu 18 Apr '18

18 Apr '18

Hi, I can not find how to extract tags with ":" in it. Can anybody show me the correct code to extract "arxiv:primary_category"? Thanks. $ ./main.py <<EOF <feed xmlns="http://www.w3.org/2005/Atom"> <entry> <arxiv:primary_category xmlns:arxiv="http://arxiv.org/schemas/atom" term="cs.NE" scheme="http://arxiv.org/schemas/atom"/> </entry> </feed> EOF $ cat main.py #!/usr/bin/env python # vim: set noexpandtab tabstop=2 shiftwidth=2 softtabstop=-1 fileencoding=utf-8: import sys from lxml import etree tree = etree.parse(sys.stdin) for e in tree.iterfind('{http://www.w3.org/2005/Atom}arxiv:primary_category'): print etree.tostring(e) -- Regards, Peng

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What "xmlns" does?
by Peng Yu 18 Apr '18

18 Apr '18

Hi, I got the following different results. Could anybody let me know how to always extract the entry element whether "xmlns" exists or not? Thanks. $ cat main.py #!/usr/bin/env python # vim: set noexpandtab tabstop=2 shiftwidth=2 softtabstop=-1 fileencoding=utf-8: import sys from lxml import etree tree = etree.parse(sys.stdin) print [etree.tostring(e) for e in tree.iterfind('.//entry')] $ ./main.py <<EOF <feed xmlns="http://www.w3.org/2005/Atom"> <entry> <id>http://arxiv.org/abs/1712.02316v1</id> </entry> </feed> EOF [] $ ./main.py <<EOF <feed> <entry> <id>http://arxiv.org/abs/1712.02316v1</id> </entry> </feed> EOF <feed> ['<entry>\n <id>http://arxiv.org/abs/1712.02316v1</id>\n </entry>\n'] -- Regards, Peng

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lxml - The Python XML Toolkit April 2018