Mailman 3 June 2010 - lxml - The Python XML Toolkit

[lxml-dev] lxml has its page on launchpad
by Stefan Behnel April 11, 2023

April 11, 2023

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 April 10, 2023

April 10, 2023

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 Jan. 30, 2023

Jan. 30, 2023

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 Jan. 11, 2023

Jan. 11, 2023

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 Aug. 31, 2022

Aug. 31, 2022

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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[lxml-dev] confusing xpath performance characteristics
by jholg＠gmx.de Aug. 24, 2012

Aug. 24, 2012

Hi, I ran into some performance characteristics of lxml/libxml2 xpath that I find rather confusing: I try to find the @type attribute of a certain element in an XML Schema (which contains lots of complexType definitions with lots of elements in them; unfortunately I can't post the schema): >>> timeit.Timer(stmt="""xpath(schema)""", setup="""from lxml import etree, objectify; schema=etree.parse('NDM.xsd').getroot(); xpath = etree.XPath('//xs:element[@name="equity"]/@type', namespaces={'xs': 'http://www.w3.org/2001/XMLSchema'})""").repeat(number=10) [0.095885038375854492, 0.096823930740356445, 0.096174955368041992] So I think I'm being smart and give a little more path information - reckoning that this should *improve* performance: >>> timeit.Timer(stmt="""xpath(schema)""", setup="""from lxml import etree, objectify; schema=etree.parse('NDM.xsd').getroot(); xpath = etree.XPath('/xs:schema//xs:element[@name="equity"]/@type', namespaces={'xs': 'http://www.w3.org/2001/XMLSchema'})""").repeat(number=10) [0.1770780086517334, 0.1775970458984375, 0.17748594284057617] Hm. Performance degrades slightly. I'm adding even more of the path to where my desired elements live in the schema: >>> timeit.Timer(stmt="""xpath(schema)""", setup="""from lxml import etree, objectify; schema=etree.parse('xsd/NDM.xsd').getroot(); xpath = etree.XPath('/xs:schema/xs:complexType//xs:element[@name="equity"]/@type', namespaces={'xs': 'http://www.w3.org/2001/XMLSchema'})""").repeat(number=10) [103.79744100570679, 103.83671712875366, 103.61817717552185] What??? >>> timeit.Timer(stmt="""xpath(schema)""", setup="""from lxml import etree, objectify; schema=etree.parse('/ae/data/pydev/hjoukl/NDM/SVN_CO/TRUNK/ndm/reference/xsd/NDM.xsd').getroot(); xpath = etree.XPath('/xs:schema/xs:complexType/*/xs:element[@name="equity"]/@type', namespaces={'xs': 'http://www.w3.org/2001/XMLSchema'})""").repeat(number=10) [0.044407129287719727, 0.044126987457275391, 0.044229030609130859] >>> Ok, this version's better than my naive approach, which seems logical to me. But why would '/xs:schema/xs:complexType//xs:element[@name="equity"]/@type' perform drastically slower than '/xs:schema/xs:complexType//xs:element[@name="equity"]/@type' ? libxml2 problem? Running the same xpaths in Oxygen I don't notice performance differences (can't profile this). Holger -- GRATIS für alle GMX-Mitglieder: Die maxdome Movie-FLAT! Jetzt freischalten unter http://portal.gmx.net/de/go/maxdome01

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[lxml-dev] html.xpath returns not decoded unicode string
by Piotr Owcarz June 30, 2010

June 30, 2010

Hi guys, I try to parse html encoded in 'iso-8859-2' and with xpath want to get a specific content. The content I usually get with xpath is python unicode, but in this case it does not contain unicode code points but characters encoded in 'iso-8859-2' just like it was never decoded and put in unicode object as it is. Let's take for example this url: ' http://www.pkm.jaworzno.pl/rozklady/rozklad.php?kat=302_20100628&nr=14&kier…', and do something in command line: >>> from lxml import html >>> import urllib2 >>> root = html.parse(urllib2.urlopen(' http://www.pkm.jaworzno.pl/rozklady/rozklad.php?kat=302_20100628&nr=14&kier…' )) >>> root.docinfo.encoding 'iso-8859-2' >>> header = root.xpath('/html/body/center/center[1]/table/tr/td/table')[3].text_content().strip() >>> header u'Soboty, niedziele i \xb6wi\xeata' >>> uc = u'Soboty, niedziele i święta' >>> uc u'Soboty, niedziele i \u015bwi\u0119ta' >>> uc == header False I expect header and uc variables to be equal but they're not, while uc is the actual unicode representation of my string. I use this code in a script and run it on Windows with english locale and the script has # -*- coding: utf-8 -*- directive. Interesting thing is that the script passes the compassion uc==header on http://www.pkm.jaworzno.pl/rozklady/rozklad.php?kat=302_20100628&nr=*13*&ki… but does not pass on http://www.pkm.jaworzno.pl/rozklady/rozklad.php?kat=302_20100628&nr=*14*&ki…. Needless to say, the content I try to get (Soboty, niedziele i święta) on both pages is binary the same, as well as declared encoding and they both render correctly in a web browser. Can anybody help me with this? OS: Windows XP (english) 32 bit Python: 2.6.5 lxml.etree: (2, 2, 0, 0) libxml used: (2, 7, 2) libxml compiled: (2, 7, 2) libxslt used: (1, 1, 24) libxslt compiled: (1, 1, 24) Regards Piotr

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[lxml-dev] Relax NG validation question
by Fred Drake June 28, 2010

June 28, 2010

I've been using jing to validate documents against a schema written in the RelaxNG compact syntax. I'd like to use lxml to validate instead of using jing. After converting the schema to the XML syntax using trang, I'm loading the schema like so: >>> import lxml.etree >>> doc = lxml.etree.parse("top.rng") >>> schema = lxml.etree.RelaxNG(doc) Traceback (most recent call last): File "<console>", line 1, in <module> File "relaxng.pxi", line 84, in lxml.etree.RelaxNG.__init__ (src/lxml/lxml.etree.c:114962) RelaxNGParseError: xmlRelaxNG: include middle.rng has a define anyElement but not the included grammar, line 9 I suspect something about the include structure of my schema is causing lxml this heartburn. I've reproduced this with a cut-down version of the schema, but I'm using the same include structure as the original, since I suspect that's essential (and I'd like to retain that instead of restructuring the actual schema). My schema is written as three files (attached): base.rng This is really just a very-slightly-modified copy of the Atom schema. It defines an "anyElement" pattern. This can be loaded on it's own. middle.rng This includes and extends base.rng. It makes no specific mention of the "anyElement" pattern. This can be loaded on it's own. top.rng This is the top-level schema that I actually care about validating; it overrides the "anyElement" pattern as part of the include of middle.rng. Building the RelaxNG object from this document causes the exception shown above. Any ideas? I'm using Python 2.6.5 and lxml 2.2.6, libxml2 2.7.7, and libxslt 1.1.26. -Fred -- Fred L. Drake, Jr. <fdrake at gmail.com> "Chaos is the score upon which reality is written." --Henry Miller

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[lxml-dev] AAAAAARGGHHH!!!
by Emanuele D'Arrigo June 28, 2010

June 28, 2010

AAAAAARGGHH!!! I just installed the latest version of an SDK I'm using and they are now based on Python 2.6.x!!!! I guess I'll have to go back to the previous version of the SDK. <sigh>. I'm noticing *here <http://pypi.python.org/pypi/lxml/2.2.6>* that the hold up for a 2.6-compatible distribution of lxml is the wait for a new build of libxml as 2.7.6 generates some crashes. Is that still the case? Manu

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[lxml-dev] some troubles building lxml dev version
by jholg＠gmx.de June 25, 2010

June 25, 2010

Hi, a few quick notes as I've just had some difficulties to build the lxml dev version from the dev instructions (http://codespeak.net/lxml/dev/build.html): * easy_install 'Cython>=0.13' does not work as there seems not to be a 0.13 release of Cython * I tried the latest official Cython release 0.12.1, but cythoning the lxml sources failed * I was then unsure what to download from cython.org as the repository layout seems a bit unusual (coming from a rather cvs/subversion background, that is - but still: no version-tagged repos, no 'trunk', 'cython' denotes the latest release); also didn't find any wiki entry on how to download/checkout cython "trunk" I finally tried hg clone http://hg.cython.org/cython-devel and built lxml trunk with it, which just seemed to succeed. One more note: cython-devel version info says 0.12.1. Holger -- GMX DSL: Internet-, Telefon- und Handy-Flat ab 19,99 EUR/mtl. Bis zu 150 EUR Startguthaben inklusive! http://portal.gmx.net/de/go/dsl

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