lxml - The Python XML Toolkit July 2014

lxml@python.org

20 participants
25 discussions

[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] Checking whether a node is a comment/element
by Geoffrey Sneddon 11 Jan '23

11 Jan '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] 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] lxml has its page on launchpad
by Stefan Behnel 21 Sep '22

21 Sep '22

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] 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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generating html with incremental writer
by Burak Arslan 25 Sep '14

25 Sep '14

Hi, Is there a way to pass method='html' to etree.xmlfile()? Or any other way to serialize incrementally to html? Best, Burak

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lxml 3.3.5 + static deps on CentOS 6.5
by Fabio Sangiovanni 08 Aug '14

08 Aug '14

Hi everybody, I'm trying to build lxml 3.3.5 with static deps on a CentOS 6.5 box, so far without success. CentOS 6.5 ships with libxml2 2.7.6 and libxslt 1.1.26. I'd like to get the latest versions of both (libxml2 2.9.1 and libxslt 1.1.28). After a lot of experiments, I came up with the following way to install lxml: CFLAGS="$CFLAGS -fPIC -lgcrypt -ldl -lgpg-error -lrt" STATIC_DEPS=true pip2.7 install lxml -fPIC: seems to be mandatory on x86_64 (build fails otherwise) -lrt: fixes an issue with old versions of GCC (4.4.7 on CentOS 6.5), that results in 'undefined symbol clock_gettime' on import. -lgcrypt -ldl -lgpg-error: fixes similar import issues when libgcrypt is installed on the system (it's the output of libgcrypt-config --libs). But still, I get an error on import, that I couldn't be able to fix: Python 2.7.7 (default, Jun 16 2014, 15:17:40) [GCC 4.4.7 20120313 (Red Hat 4.4.7-4)] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> from lxml import html Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/usr/local/lib/python2.7/site-packages/lxml/html/__init__.py", line 42, in <module> from lxml import etree ImportError: /usr/local/lib/python2.7/site-packages/lxml/etree.so: undefined symbol: libiconv >>> Is there some safe way to get static deps installed with lxml on a CentOS 6.5 system? Am I on the right track or am I totally missing something? Should I maybe just use the system libs (their versions seems not to be recommended by the docs...)? I'm using CPython 2.7.7. Thanks for your help! -- Fabio Sangiovanni

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How to iterate through nodes of xml through xslt
by varun bhatnagar 01 Aug '14

01 Aug '14

Hi, I have two xml files. *File1.xml* *<?xml version="1.0" encoding="UTF-8"?>* *<InfoTag>* *<Procedure attrProc="TestProcA" attrLevel="1">* * <downTime>* * <acceptableDownTime>* * <all/>* * </acceptableDownTime>* * <downTimePeriod time="600000000"/>* * </downTime>* * </Procedure>* * <Procedure attrProc="TestProcB" attrLevel="2">* * <downTime>* * <acceptableDownTime>* * <all/>* * </acceptableDownTime>* * <downTimePeriod time="600000000"/>* * </downTime>* * </Procedure>* *</InfoTag>* *File2.xml* *<?xml version="1.0" encoding="UTF-8"?>* *<InfoTag>* *<Procedure attrProc="TestProcC" attrLevel="3">* * <downTime>* * <acceptableDownTime>* * <all/>* * </acceptableDownTime>* * <downTimePeriod time="600000000"/>* * </downTime>* * </Procedure>* * <Procedure attrProc="TestProcD" attrLevel="4">* * <downTime>* * <acceptableDownTime>* * <all/>* * </acceptableDownTime>* * <downTimePeriod time="600000000"/>* * </downTime>* * </Procedure>* *</InfoTag>* I am trying to fetch an output file which looks like this: *Output.xml* *<InfoTag>* *<Procedure attrProc="1" attrLevel="### NOT UNIQUE ###">* * <downTime>* * <acceptableDownTime>* * <all/>* * </acceptableDownTime>* * <downTimePeriod time="600000000"/>* * </downTime>* * </Procedure>* * <Procedure attrProc="2" attrLevel="### NOT UNIQUE ###">* * <downTime>* * <acceptableDownTime>* * <all/>* * </acceptableDownTime>* * <downTimePeriod time="600000000"/>* * </downTime>* * </Procedure>* *<Procedure attrProc="3" attrLevel="### NOT UNIQUE ###">* * <downTime>* * <acceptableDownTime>* * <all/>* * </acceptableDownTime>* * <downTimePeriod time="600000000"/>* * </downTime>* * </Procedure>* * <Procedure attrProc="4" attrLevel="### NOT UNIQUE ###">* * <downTime>* * <acceptableDownTime>* * <all/>* * </acceptableDownTime>* * <downTimePeriod time="600000000"/>* * </downTime>* * </Procedure> * *</InfoTag>* The number of Procedure tag (<Procedure>) can be different every time. So I have to read this tag every time from each xml and then merge it sequentially. Can anyone tell me how to achieve this. How can I loop every Procedure tag and and append the attrProc attribute value in a sequential order? Thanks, BR, Varun

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problem with removing elements: bug or feature
by Martin Mueller 31 Jul '14

31 Jul '14

I have run into the following problem with removing an element, and I can't figure out whether it's a bug or whether I'm missing something. I want to make a change to an element, depending on the next element, and delete that next element. The change and deletion occur in a function. The main code program like this: if element.getnext() is not None \ and element.getnext().get('rend') == 'superscript': element = processSuperscripts(element, tree, changelog) The function first spells out the change and then orders the deletion; parent = element.getnext().getparent() parent.remove(element.getnext()) This code works the first time, but it doesn't work on successive occasions. I have used a work around where I add a flag to the next element and delete it in a separate loop. Thus my function ends element.getnext().set('n', 'DELETE') and the main program adds the loop: for element in tree.iter(tei + 'w'): if element.get('n') == 'DELETE': parent = element.getparent() parent.remove(element) This works: all instances of the first element are properly changed and all instances of the second element are properly deleted. Is there a way of making the deletion work inside the function without a second "clean-up" loop? Martin Mueller Professor emeritus of English and Classics Northwestern University

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Use the default namespace from nsmap
by Ivan Pozdeev 30 Jul '14

30 Jul '14

Hello Lxml, A googling confirmes that I'm far from the only one bitten badly by the lack of automatic usage of the default `xmlns'. I've written a wrapper that auto-prefixes the tags (like many others, I suspect. it's in attachment). Since starting usgin them by default right off the bat would be controversial, i suggest to make it an option to `xpath()' and collect user feedback for some time. We can use my code for that. It doesn't handle the case where the automatically-added prefix already exists but is written to be robust otherwise. Afterwards, we could start convincing libxml2 team to support NULL for xmlNs::prefix based on existing user experience. -- Best regards, Ivan mailto:vano@mail.mipt.ru

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lxml - The Python XML Toolkit July 2014