Mailman 3 December 2014 - 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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Generating code from schema
by Charlie Clark 29 Jan '15

29 Jan '15

Hi, just a quick question about what you can and cannot do with lxml's schema support. In openpyxl we're moving towards a 1:1 implementation of the underlying schema. lxml.objectify isn't directly an option for two reasons: lxml is an optional dependency and there are cases where we'd definitely run out of memory. Instead we're using descriptors to enforce type definitions. This means a little more code but now that it seems to be working well I was thinking whether we could automate some of the process. I've looked at some of the existing XSD to Python generators but the generated code is far from what I'd like to have. Can we use the lxml schema support for anything other than validation? ie. can I query a schema object for a particular definition? Or is the best approach to parse the XSD files directly and work through the definitions with a mapping? Charlie -- Charlie Clark Managing Director Clark Consulting & Research German Office Kronenstr. 27a Düsseldorf D- 40217 Tel: +49-211-600-3657 Mobile: +49-178-782-6226

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etree.xmlfile shadows exceptions thrown by output
by D.H.J. Takken 28 Jan '15

28 Jan '15

Hello, I use etree.xmlfile and a coroutine to generate XML into a file-like object that does post-processing on the XML data. Now, if I use the send() method to produce invalid XML data, the post-processor throws an exception. Here, I see a little problem: No matter what exception is thrown by the post-processor, the send() method always generates a generic IO exception. Apparently, lxml catches any exception thrown by the file-like object and produces a generic IO exception in stead. This means that there is no way to know what exactly went wrong in the post-processor. That information is lost. Inside the coroutine, I *do* get the original exception from the post-processor, but doing the error handling there is kind of ugly. Is there a better way to solve this problem? Thanks a lot!

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XML Digital Signature (Xades)
by Ovnicraft 04 Jan '15

04 Jan '15

Hi to all ! Maybe this topic is off, but i want to comment here and get your feedback. I am working in digital signatures for my country and i want to work just in python, so my work start reading espec about xades[1], nothing complicated, now i see lxml can help me but i want to know if anyone here has experience around this. I have an example about xml file[2] and see basic x509 cert use and RSA key. Any comment are really appreciated ! Regards ! [1] http://www.w3.org/TR/XAdES/ [2] https://gist.github.com/ovnicraft/c8645904e01e0a071199 -- [image: Cristian Salamea on about.me] Cristian Salamea about.me/ovnicraft <http://about.me/ovnicraft>

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Bug with lxml 3.4.1
by Luis González Fernández 27 Dec '14

27 Dec '14

Hi all: I'm working in a parser for XML files and i found and behaviour in lxml-python both in linux and os x. When i try to use .find() or findall() functions, the problem seams to be when someone try to deal with tag declared inside a namespace without prefix. Here an example to reproduce the bug: Vengeance:ioc luisgf$ python3 Python 3.4.2 (v3.4.2:ab2c023a9432, Oct 5 2014, 20:42:22) [GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> from lxml import etree >>> data = open("duqu.ioc","rb").read() >>> root = etree.fromstring(data) >>> print(root.nsmap) {'xsi': 'http://www.w3.org/2001/XMLSchema-instance', None: 'http://schemas.mandiant.com/2010/ioc', 'xsd': 'http://www.w3.org/2001/XMLSchema'} >>> print(root[6].tag) {http://schemas.mandiant.com/2010/ioc}definition >>> root.find('definition', root.nsmap) Traceback (most recent call last): File "<stdin>", line 1, in <module> File "lxml.etree.pyx", line 1448, in lxml.etree._Element.find (src/lxml/lxml.etree.c:51339) File "/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/lxml/_elementpath.py", line 281, in find it = iterfind(elem, path, namespaces) File "/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/lxml/_elementpath.py", line 271, in iterfind selector = _build_path_iterator(path, namespaces) File "/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/lxml/_elementpath.py", line 234, in _build_path_iterator return _cache[(path, namespaces and tuple(sorted(namespaces.items())) or None)] TypeError: unorderable types: NoneType() < str() >>> -- -- Luis González Fernández https://www.luisgf.es PGP ID: C918B80F (DD6F BFC1 FC14 4C81 34F8 EA1E 6BCB C27F C918 B80F) Twitter: @luisgf_2001 / Jabber: luisgf(a)mijabber.es

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Extracting titles from links
by Jason Williams 24 Dec '14

24 Dec '14

I want to be able to grab the title of articles from a webpage. I wrote my script using the following XPath *en_tree.xpath('//a[@class="pubSectionTitle"]')* To grab from the following example XML: *<a href='/en/publications/**magazines/wp20141201/ancient-* *city-timgad/' class="pubSectionTitle" title="Timgad—A Buried City Reveals Its Secrets"> Timgad<wbr />—A Buried City Reveals Its Secrets </a> * When I encounter the above example, and continue with my script (See the code below) I only get 'Timgad', not the entire title. Thanks for any help, I'm very inexperienced with this! *en_toc = en_tree.xpath('//a[@class="* *pubSectionTitle"]') for title in chs_toc: entry = title.text.strip() en_titles.append(entry)*

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