Mailman 3 November 2021 - 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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Tested value modified in validation error message
by Bob Kline 15 Jul '22

15 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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DOM traversal with xml, saving record into a graph databse. iteration issue.
by KOKOU AFIDEGNON 23 Nov '21

23 Nov '21

Hi, I posted a question on Stackoverflow about an issue I'm facing while passing the lxml node in order to obtain the ids and passing tn order to build a graph tree. Can you please give me your insight about this issue? https://stackoverflow.com/q/68576410/5713751

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Python 2to3 Regression in c14n2 Serialization?!
by Kai Hillmann 18 Nov '21

18 Nov '21

Hi, I’m not sure if I just overlooked something but it seems that etree.tostring using method c14n2 does not work in the same way in Python2 and Python3. In Python2 it works as expected in Python3 it claims about a not declared namespace which is is still there (see stdout information in tests). I put together a simple TestCase class (https://pastebin.com/raw/fgMjy0Ax) which shows the different behaviour if invoked for the latest released lxml version 4.6.4 using Python2 or Python3: c:\python27\python.exe -m nose ./py3_test.py .... ---------------------------------------------------------------------- Ran 4 tests in 0.014s OK c:\python39\python.exe -m nose ./py3_test.py EEEE ====================================================================== ERROR: test_python3_problem_bytesio_iterparse (py3_test.LXML_C14N2_RegressionTest) ---------------------------------------------------------------------- Traceback (most recent call last): File "c:\devel\code\cs.requirements\py3_test.py", line 18, in test_python3_problem_bytesio_iterparse handle_div_end(event, element) File "c:\devel\code\cs.requirements\py3_test.py", line 13, in handle_div_end etree.tostring(element, method="c14n2") File "src\lxml\etree.pyx", line 3407, in lxml.etree.tostring File "src\lxml\serializer.pxi", line 943, in lxml.etree._tree_to_target File "src\lxml\serializer.pxi", line 1128, in lxml.etree.C14NWriterTarget.start File "src\lxml\serializer.pxi", line 1155, in lxml.etree.C14NWriterTarget._start File "src\lxml\serializer.pxi", line 1085, in lxml.etree.C14NWriterTarget._qname ValueError: Namespace http://www.w3.org/1999/xhtml of name "div" is not declared in scope -------------------- >> begin captured stdout << --------------------- <class 'str'> <class 'str'> some_ns_id = http://www.example.com <class 'str'> <class 'str'> xhtml = http://www.w3.org/1999/xhtml --------------------- >> end captured stdout << ---------------------- ====================================================================== ERROR: test_python3_problem_bytesio_iterparse_global_ns_registration (py3_test.LXML_C14N2_RegressionTest) ---------------------------------------------------------------------- Traceback (most recent call last): File "c:\devel\code\cs.requirements\py3_test.py", line 34, in test_python3_problem_bytesio_iterparse_global_ns_registration handle_div_end(event, element) File "c:\devel\code\cs.requirements\py3_test.py", line 29, in handle_div_end etree.tostring(element, method="c14n2") File "src\lxml\etree.pyx", line 3407, in lxml.etree.tostring File "src\lxml\serializer.pxi", line 943, in lxml.etree._tree_to_target File "src\lxml\serializer.pxi", line 1128, in lxml.etree.C14NWriterTarget.start File "src\lxml\serializer.pxi", line 1155, in lxml.etree.C14NWriterTarget._start File "src\lxml\serializer.pxi", line 1085, in lxml.etree.C14NWriterTarget._qname ValueError: Namespace http://www.w3.org/1999/xhtml of name "div" is not declared in scope -------------------- >> begin captured stdout << --------------------- <class 'str'> <class 'str'> some_ns_id = http://www.example.com <class 'str'> <class 'str'> xhtml = http://www.w3.org/1999/xhtml --------------------- >> end captured stdout << ---------------------- ====================================================================== ERROR: test_python3_problem_filebased_iterparse (py3_test.LXML_C14N2_RegressionTest) ---------------------------------------------------------------------- Traceback (most recent call last): File "c:\devel\code\cs.requirements\py3_test.py", line 49, in test_python3_problem_filebased_iterparse handle_div_end(event, element) File "c:\devel\code\cs.requirements\py3_test.py", line 44, in handle_div_end etree.tostring(element, method="c14n2") File "src\lxml\etree.pyx", line 3407, in lxml.etree.tostring File "src\lxml\serializer.pxi", line 943, in lxml.etree._tree_to_target File "src\lxml\serializer.pxi", line 1128, in lxml.etree.C14NWriterTarget.start File "src\lxml\serializer.pxi", line 1155, in lxml.etree.C14NWriterTarget._start File "src\lxml\serializer.pxi", line 1085, in lxml.etree.C14NWriterTarget._qname ValueError: Namespace http://www.w3.org/1999/xhtml of name "div" is not declared in scope -------------------- >> begin captured stdout << --------------------- <class 'str'> <class 'str'> some_ns_id = http://www.example.com <class 'str'> <class 'str'> xhtml = http://www.w3.org/1999/xhtml --------------------- >> end captured stdout << ---------------------- ====================================================================== ERROR: test_python3_problem_filebased_parse (py3_test.LXML_C14N2_RegressionTest) ---------------------------------------------------------------------- Traceback (most recent call last): File "c:\devel\code\cs.requirements\py3_test.py", line 62, in test_python3_problem_filebased_parse serialize_div_element(div) File "c:\devel\code\cs.requirements\py3_test.py", line 58, in serialize_div_element etree.tostring(element, method="c14n2") File "src\lxml\etree.pyx", line 3407, in lxml.etree.tostring File "src\lxml\serializer.pxi", line 943, in lxml.etree._tree_to_target File "src\lxml\serializer.pxi", line 1128, in lxml.etree.C14NWriterTarget.start File "src\lxml\serializer.pxi", line 1155, in lxml.etree.C14NWriterTarget._start File "src\lxml\serializer.pxi", line 1085, in lxml.etree.C14NWriterTarget._qname ValueError: Namespace http://www.w3.org/1999/xhtml of name "div" is not declared in scope -------------------- >> begin captured stdout << --------------------- <class 'str'> <class 'str'> some_ns_id = http://www.example.com <class 'str'> <class 'str'> xhtml = http://www.w3.org/1999/xhtml --------------------- >> end captured stdout << ---------------------- ---------------------------------------------------------------------- Ran 4 tests in 0.010s FAILED (errors=4) Could you give me some hint whether this is an actual bug or just a wrong usage? If it is a bug – should I create a new one in your bug tracker or will you add one directly? Best regards, Kai

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Does findall() return elements in document order?
by Eero Holmström 05 Nov '21

05 Nov '21

Hello, I have a simple question: Does the findall() method of lxml return elements in document order? So far, I find empirically that it does, and I have not seen an exception to this rule. But the documentation does not mention anything about the ordering of the elements being returned. Does the implementation still guarantee, that elements are returned in document order? Thanks for your help, Eero

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Wheels for Python 3.10 on Windows and macOS
by safihre＠sabnzbd.org 04 Nov '21

04 Nov '21

Could you provide binary wheels for Windows and macOS for Python 3.10 through PyPi? All our CI is failing (Windows) or taking ages (macOS) because it has to compile lxml from source. Thank you!

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lxml - The Python XML Toolkit November 2021