Mailman 3 April 2017 - 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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thread-specific data for xslt callbacks
by Bob Kline 13 Oct '17

13 Oct '17

I need to make some thread-specific data available to my xslt function callbacks. I think I've sort of reverse-engineered a way to do it, by creating my own parser class, stuffing the data I need into an instance of that class, using the parser instance to parse the XSL/T filter, and then in the extension function following the context argument's context_node to its root tree, which in turn gets me back to my own parser object (and my thread-specific data). Is there a more elegant way to do it that I just haven't yet stumbled across in reading through the API docs? Thanks! -- Bob Kline http://www.rksystems.com mailto:bkline@rksystems.com

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Returning Multiple Schema Errors when Using Iterparse
by Philip Zerull 11 May '17

11 May '17

Hi everyone, So I have to validate vary large xml files (gigabytes large) against xsd schema files. I have been asked to produce line and column numbers where the errors occurred in the file. I'm using: Python 3.5.2 lxml 3.7.3 libxml2 2.9.3+dfsg1-1ubuntu0.2 Ubuntu 16.04 The following code does a good job of getting a list of all the issues with the xml file that I can nicely present to the user (for brevity I left out a bunch of try/catch statements). This works great because it also gives the line and column numbers in the xml file where the issues occurred: schema_root = etree.XML(xsd_file.read()) schema = etree.XMLSchema(schema_root) parser = etree.XMLParser(schema=schema) parsed_xml = etree.XML(xml_file.read()) if not schema.validate(parsed_xml): errors_list = schema.errors_log Unfortunately, this results in reading the entire file in memory. Alternatively, I can do the following: schema_root = etree.XML(xsd_file.read()) schema = etree.XMLSchema(schema_root) for event, elem in etree.iterparse(xml_file, schema=schema): #clear stuff from memory elem.clear() parent = elem.getparent() while elem.getprevious() is not None: del elem.getparent()[0] If the xml fails to validate against the xsd file then the iterator returned by etree.iterparse's next method raises an etree.XMLSyntaxError for the first xsd issue it finds. This does a great job of keeping the memory usage constant over even very large files, but it only tells me if the xsd file is valid or not. It does not give me a list of issues like the previously mentioned method does. I tried just catching the XMLSyntaxError by surrounding only the iterator's next method with a try/catch and attempting to move on with the file even if the error was raised, but that just resulted in an infinite loop where the iterator's next method continuously raised the same error for the same element and stopped progressing through the file. It's very tempting to think that there must be a way to get the best of both worlds here, but I've scoured the documentation, tried a few things, as well as briefly dug into the code a bit but I haven't had any luck yet. I'm not even sure doing this would be possible using iterparse. Any advice in this area would be greatly appreciated. Regards, Phil Zerull

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lxml / html5parser return values
by Chris Jerdonek 29 Apr '17

29 Apr '17

Hi, It feels like I could be missing something very simple, but is there a way to invoke lxml.html.html5parser's parsing methods so that they return elements satisfying lxml.html's richer HTML element API (described below)? http://lxml.de/lxmlhtml.html#html-element-methods >From what I've been able to try so far, the html5parser API only returns elements satisfying the more limited ElementTree API. Thanks, --Chris

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mailman issue?
by Chris Jerdonek 28 Apr '17

28 Apr '17

Hi, FYI, I received the "lxml.de mailing list memberships reminder" email four times within the past twelve hours. Also, I got a "550 5.2.0 No such mailbox" error when I tried e-mailing the questions / problems / comments address in the reminder e-mail: mailman-owner(a)lxml.de --Chris

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Need more information from the schema validator
by Bob Kline 24 Apr '17

24 Apr '17

I tried asking this a week ago, and I must not have done a good job of framing my question, so let's try again (I'll try asking my questions in German if you tell me that it will increase the chances of getting a reply). How do I get the schema validator to give me a reference to the element where an error was found? Python : sys.version_info(major=3, minor=6, micro=0, releaselevel='final', serial=0) lxml.etree : (3, 7, 3, 0) libxml used : (2, 9, 4) libxml compiled : (2, 9, 4) libxslt used : (1, 1, 29) libxslt compiled : (1, 1, 29) Besten Dank im Voraus! -- Bob Kline http://www.rksystems.com mailto:bkline@rksystems.com

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