lxml - The Python XML Toolkit May 2022

lxml@python.org

10 participants
18 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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Tested value modified in validation error message
by Bob Kline 16 Jul '22

16 Jul '22

Before I file a ticket, I wanted to check here to find out if this is a known problem (I searched the bug tracker, but didn't see any matches). Our customer is using a commercial XML editor and the editor's implementation of the DOM API sometimes garbles whitespace inside text nodes when serializing XML documents for the document's xml property. This causes schema validation errors when we send that serialization off to be validated against the document type's schema using lxml. The problem we have run into with lxml is that the message property of the error object which comes back in the schema object's error_log has altered the value being validated. So, for example, if the text content of an element in the serialized DOM is "Processing\ncomplete" and the value it was supposed to match in the enumerated valid values is "Processing complete" then the message attribute for the corresponding object in the error_log has Element 'ProcessingStatusValue': [facet 'enumeration'] The value 'Processing complete' is not an element of the set {'Ready for English peer review', 'Ready for English scientific review', 'Ready for English OCCM review', 'Ready for Spanish peer review', 'Ready for Spanish OCCM review', 'Ready for publishing', 'Ready for translation', 'Processing complete'}. In effect saying "the value 'Processing complete' does not match the value 'Processing complete'." Took a very long time for us to figure out that the error message was wrong, and that it should have said ... The value 'Processing\ncomplete' is not an element of the set .... -- Bob Kline https://www.rksystems.com mailto:bkline@rksystems.com

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Build problems on Python 3.11
by Charlie Clark 01 Jun '22

01 Jun '22

Hi, while I don't see this locally, I'm getting problems on my CI with the Docker Image: ``` Compile failed: command '/usr/bin/gcc' failed with exit code 1 cc -I/usr/include/libxml2 -I/usr/include/libxml2 -c /tmp/xmlXPathInitw7u6s7rr.c -o tmp/xmlXPathInitw7u6s7rr.o cc tmp/xmlXPathInitw7u6s7rr.o -lxml2 -o a.out error: command '/usr/bin/gcc' failed with exit code 1 [end of output] note: This error originates from a subprocess, and is likely not a problem with pip. error: legacy-install-failure × Encountered error while trying to install package. ╰─> lxml ``` I'm wondering if there is anything that can be done about this? Presumably inform the maintainer? Charlie -- Charlie Clark Managing Director Clark Consulting & Research German Office Sengelsweg 34 Düsseldorf D- 40489 Tel: +49-203-3925-0390 Mobile: +49-178-782-6226

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Re: : Re: getparent() fails with "AttributeError: 'list' object has no attribute 'getparent' "
by Holger.Joukl＠LBBW.de 30 May '22

30 May '22

> Through trial and error, it looks like xpath() returns an array, even if only one > element is found in the tree. Behold the power of the great docs: https://lxml.de/xpathxslt.html#xpath "[...] XPath return values The return value types of XPath evaluations vary, depending on the XPath expression used: - True or False, when the XPath expression has a boolean result - a float, when the XPath expression has a numeric result (integer or float) - a 'smart' string (as described below), when the XPath expression has a string result. - a list of items, when the XPath expression has a list as result. The items may include Elements (also comments and processing instructions), strings and tuples. Text nodes and attributes in the result are returned as 'smart' string values. Namespace declarations are returned as tuples of strings: (prefix, URI). [...]" ;-) Best regards, Holger Landesbank Baden-Wuerttemberg Anstalt des oeffentlichen Rechts Hauptsitze: Stuttgart, Karlsruhe, Mannheim, Mainz HRA 12704 Amtsgericht Stuttgart HRA 4356, HRA 104 440 Amtsgericht Mannheim HRA 40687 Amtsgericht Mainz Die LBBW verarbeitet gemaess Erfordernissen der DSGVO Ihre personenbezogenen Daten. Informationen finden Sie unter https://www.lbbw.de/datenschutz.

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getparent() fails with "AttributeError: 'list' object has no attribute 'getparent' "
by codecomplete＠free.fr 30 May '22

30 May '22

Hello, I'd like to find and replace an element in an HTML file. I can't figure out why getparent() doesn't work as expected: ============== import lxml.html from lxml.html import builder as E import lxml.etree as et import lxml.etree as et parser = et.HTMLParser(remove_blank_text=True,recover=True) with open("template.tmpl") as tempfile: template_tree = et.parse(tempfile, parser=parser) template_root = template_tree.getroot() #BAD FOO = template_root.find('.//FOO') FOO = template_root.xpath('//FOO') if len(FOO): print("FOO:",FOO) #AttributeError: 'list' object has no attribute 'getparent' parent = FOO.getparent() parent.insert(parent.index(FOO)+1,ET.XML("<bar/>")) #Remove FOO, no longer needed else: print("Not FOO") ============== What am I doing wrong? Thank you.

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[HTML] How to get text of attribute?
by Gilles 28 May '22

28 May '22

Hello, My XPath skills being what they are… in an HTML file, I can't figure out how to grab the text of the second attribute in a meta element: ================== with open("input.html") as tempfile: parser = et.HTMLParser(remove_blank_text=True,recover=True) currfile_tree = et.parse(tempfile, parser=parser) currfile_root = currfile_tree.getroot() """ <head> <title>Blah</title> <meta name="description" content="HERE"/> </head>' """ description=currfile_root.xpath("//meta[@name='description' and @content]") ================== Any idea? Thank you.

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lxml - The Python XML Toolkit May 2022