Mailman 3 June 2007 - lxml - The Python XML Toolkit

[lxml-dev] is tostring() confusing?
by Ian Bicking June 13, 2007

June 13, 2007

Having tostring() as a function and not a method seems a bit odd to me. I know it's from ElementTree, but at least for HTML it's awkward -- using lxml.etree.tostring on HTML is almost certain to create bad output; the output won't be real XHTML (lacking namespaces and it'll probably be invalid), and it will parse quite badly as HTML (<script src="..."/> for instance will typically break the entire page in a browser). When I was first using ElementTree, I remember being a bit baffled by the lack of a serializing method. I then found tostring and kind of forgot about it, but as I copy tostring methods around (e.g., lxml.html.tostring) it's starting to seem like a problem again. -- Ian Bicking | ianb(a)colorstudy.com | http://blog.ianbicking.org | Write code, do good | http://topp.openplans.org/careers

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[lxml-dev] helping debug osx segfaults
by whit June 13, 2007

June 13, 2007

been beating my head against getting lxml setup on osx. is there any sort of debug information I could give yall that would help or does anyone have any hot tips for getting things running? currently, I'm running trunk and having intermittent segfaults using etree. lxml is linked against most current fink libxml2 and libxslt2 (I think) I can dig out more info if it would help. -w -- ------ d. whit morriss ------ - senior engineer, opencore - - http://www.openplans.org - - m: 415-710-8975 - "If you don't know where you are, you don't know anything at all" Dr. Edgar Spencer, Ph.D., 1995

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[lxml-dev] Url corruption during XSLT transformation
by Alexander Kozlovsky June 12, 2007

June 12, 2007

Hello again! I discovered a bug which is happening during XSLT transformation Consider this simple XSLT template: >>> from lxml import etree >>> xslt = etree.XSLT(etree.XML(''' ... <xsl:stylesheet version = '1.0' xmlns:xsl='http://www.w3.org/1999/XSL/Transform'> ... <xsl:output method="html" /> ... <xsl:template match="/"> ... <xsl:copy-of select="." /> ... </xsl:template> ... </xsl:stylesheet> ... ''')) The purpose of this template is just copying all document content as HTML instead of XML. But strange thing happened with urls: /test?a=1&b=2?c=3 becomes /test?a=1 What happens is all url content after the first '&' disappears >>> xml = etree.XML('<html><body><a href="/test?x=10&y=20&z=30">sample link</a></body></html>') >>> html = str(xslt(xml)) >>> print html <html><body><a href="/test?x=10">sample link</a></body></html> Probably it is not lxml, but libxslt2 bug, but I don't know, where to submit patch I dealt with this problem by replacing all the 'copy-of' elements with identity transformation, but probably it is less effective >>> xslt2 = etree.XSLT(etree.XML(''' ... <xsl:stylesheet version = '1.0' xmlns:xsl='http://www.w3.org/1999/XSL/Transform'> ... <xsl:output method="html" /> ... <xsl:template match="/ | @* | node()"> ... <xsl:copy> ... <xsl:apply-templates select="@* | node()" /> ... </xsl:copy> ... </xsl:template> ... </xsl:stylesheet> ... ''')) >>> html2 = str(xslt2(xml)) >>> print html2 <html><body><a href="/test?x=10&y=20&z=30">sample link</a></body></html> If it is libxslt2 bug, can you please submit bug instead of me :) ? I don't know anything about libxslt2... -- Best regards, Alexander mailto:alexander.kozlovsky@gmail.com

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[lxml-dev] Is it bug?
by Alexander Kozlovsky June 12, 2007

June 12, 2007

Hello! I discover some counterintuitive behavior of 'tail' attribute: >>> from lxml import etree >>> a = etree.XML('<a><b>text</b>tail</a>') >>> b = a[0] >>> print b.tail tail >>> a[:] = [] >>> print b.tail None # EXPECTED: tail I think, it is bug or at least worth note in documentation Thank you for the great library, anyway! :) -- Best regards, Alexander mailto:alexander.kozlovsky@gmail.com

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[lxml-dev] lxml.etree.parse doesn't take parser argument into account?
by Christian Zagrodnick June 11, 2007

June 11, 2007

Hi, maybe I'm doning something very wrong here. Regarding the following: In [1]:import StringIO In [2]:import lxml.etree In [3]:import lxml.objectify In [4]:parser = lxml.etree.XMLParser() In [5]:parser.setElementClassLookup(lxml.objectify.ObjectifyElementClassLookup()) In [6]:lxml.etree.parse(StringIO.StringIO("<a/>"), parser) Out[6]:<etree._ElementTree object at 0x1450e40> I would have expected to get an objectified element out of the parse call. What am I missing here? Or is this a bug? This is lxml-1.3beta-py2.4-macosx-10.4-i386. -- Christian Zagrodnick gocept gmbh & co. kg · forsterstrasse 29 · 06112 halle/saale www.gocept.com · fon. +49 345 12298894 · fax. +49 345 12298891

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[lxml-dev] Development of Extentions
by Martin Owens June 9, 2007

June 9, 2007

Hello all, For inkscape we are looking to create a pysvg python module based on lxml; I would like very much to base the extentions on the perl based SVG::DOM2 modules which have not only XML controls but SVG methods too. I've been looking at the documentation trying to figure it all out how this can be done. So far what I think needs to happen is: we create a class that inherrits from lxml.ElementTree that will grab the right element class depending on the element name and namespace. then we make a whole bunch of classes that inherrit from the lxml.Element class which will become the controls into the lxml backend. does this ream sane? Best Regards, Martin Owens

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[lxml-dev] lxml.doctestcompare
by Ian Bicking June 7, 2007

June 7, 2007

I figured out why the tests fail when run in series, when using lxml.(html.)usedoctest -- since it works on import, the import is only run once. After that the module isn't really imported again, so the code that executes on import isn't run. I don't know if there's any feasible way around this. Well, I could unload the module when the doctest is through, just like I unload my OutputChecker hack. That might be okay. Bah. -- Ian Bicking | ianb(a)colorstudy.com | http://blog.ianbicking.org | Write code, do good | http://topp.openplans.org/careers

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[lxml-dev] python crashes in xmlDictFree inside Zope
by Eric Tiffany June 4, 2007

June 4, 2007

I have been prototyping some XMLSchema parsing/validating using lxml 1.3beta. Everthing works great from python 2.4.4 started from the command line, or running from inside Eclipse. However, when I moved my code over to my Plone product, python crashes when Zope is initializing the product. I am creating my XMLSchema object there. THe code is essentially the same, running under the same python and with the same libs (afaik). Some earlier attempts (with python 2.4.3) gave me this error: python(11139) malloc: *** Deallocation of a pointer not malloced: 0x80; This could be a double free(), or free() called with the middle of an allocated block; Try setting environment variable MallocHelp to see tools to help debug I'm not seeing that now, as I have "upgraded" to python 2.4.4 which seems to be stripped or something. I don't have a test case immediately available, but here is the stack backtrace from the python crash log: OS Version: 10.4.9 (Build 8P2137) Report Version: 4 Command: Python Path: /opt/local/Library/Frameworks/Python.framework/Versions/2.4/Resources/Python .app/Contents/MacOS/Python Parent: bash [11055] Version: 2.4a0 (2.4alpha1) PID: 11135 Thread: 0 Exception: EXC_BAD_ACCESS (0x0001) Codes: KERN_PROTECTION_FAILURE (0x0002) at 0x00000001 Thread 0 Crashed: 0 libxml2.2.dylib 0x033f6294 xmlDictFree + 45 1 libxml2.2.dylib 0x033f62e2 xmlDictFree + 123 2 libxml2.2.dylib 0x033f62e2 xmlDictFree + 123 3 etree.so 0x06406a08 __pyx_f_5etree_14_ParserContext_initThreadDictRef + 63 (etree.c:19725) 4 etree.so 0x06406a5b __pyx_f_5etree_14_ParserContext_initParserDict + 35 (etree.c:19740) 5 etree.so 0x06431bca __pyx_f_5etree_11_BaseParser__parseDocFromFile + 99 (etree.c:21340) 6 etree.so 0x0646a8f4 __pyx_f_5etree__parseDocument + 395 (etree.c:22486) 7 etree.so 0x0646cc50 __pyx_f_5etree_parse + 176 (etree.c:10300) 8 org.python.python 0x0027faca PyEval_EvalFrame + 22777 (ceval.c:3568) 9 org.python.python 0x00280665 PyEval_EvalCodeEx + 1774 (ceval.c:2741) 10 org.python.python 0x0027e49f PyEval_EvalFrame + 17102 (ceval.c:3661) 11 org.python.python 0x00280665 PyEval_EvalCodeEx + 1774 (ceval.c:2741) 12 org.python.python 0x0027e49f PyEval_EvalFrame + 17102 (ceval.c:3661) 13 org.python.python 0x0027ebaa PyEval_EvalFrame + 18905 (ceval.c:3651) 14 org.python.python 0x0027ebaa PyEval_EvalFrame + 18905 (ceval.c:3651) 15 org.python.python 0x0027ebaa PyEval_EvalFrame + 18905 (ceval.c:3651) 16 org.python.python 0x0027ebaa PyEval_EvalFrame + 18905 (ceval.c:3651) 17 org.python.python 0x0027ebaa PyEval_EvalFrame + 18905 (ceval.c:3651) 18 org.python.python 0x0027ebaa PyEval_EvalFrame + 18905 (ceval.c:3651) 19 org.python.python 0x0027ebaa PyEval_EvalFrame + 18905 (ceval.c:3651) 20 org.python.python 0x0027ebaa PyEval_EvalFrame + 18905 (ceval.c:3651) 21 org.python.python 0x0027ebaa PyEval_EvalFrame + 18905 (ceval.c:3651) 22 org.python.python 0x00280665 PyEval_EvalCodeEx + 1774 (ceval.c:2741) 23 org.python.python 0x002808a5 PyEval_EvalCode + 87 (ceval.c:490) 24 org.python.python 0x002a75fd PyRun_FileExFlags + 200 (pythonrun.c:1285) 25 org.python.python 0x002a78e0 PyRun_SimpleFileExFlags + 640 (pythonrun.c:869) 26 org.python.python 0x002b13ec Py_Main + 3199 (main.c:493) 27 org.python.python 0x00001fae 0x1000 + 4014 28 org.python.python 0x00001ed5 0x1000 + 3797 Thread 0 crashed with X86 Thread State (32-bit): eax: 0x00000000 ebx: 0x033f6275 ecx: 0x00000000 edx: 0x00000000 edi: 0x00000001 esi: 0x05856fd0 ebp: 0xbfffcfe8 esp: 0xbfffcfb0 ss: 0x0000001f efl: 0x00010286 eip: 0x033f6294 cs: 0x00000017 ds: 0x0000001f es: 0x0000001f fs: 0x00000000 gs: 0x00000037 Binary Images Description: 0x1000 - 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0x92d30fff com.apple.htmlrendering 66.1 (1.1.3) /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HTMLRender ing.framework/Versions/A/HTMLRendering 0x92d57000 - 0x92d98fff com.apple.NavigationServices 3.4.4 (3.4.3) /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/Navigation Services.framework/Versions/A/NavigationServices 0x92dbf000 - 0x92dcdfff com.apple.audio.SoundManager 3.9.1 /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/CarbonSoun d.framework/Versions/A/CarbonSound 0x92dd4000 - 0x92dd9fff com.apple.CommonPanels 1.2.3 (73) /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/CommonPane ls.framework/Versions/A/CommonPanels 0x92dde000 - 0x930d3fff com.apple.HIToolbox 1.4.9 (???) /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox. framework/Versions/A/HIToolbox --

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[lxml-dev] html branch
by Ian Bicking June 4, 2007

June 4, 2007

I've started a branch with lxml.html, in http://codespeak.net/svn/lxml/branch/html It currently includes: lxml.doctestcompare: XML/HTML doctests lxml.usedoctest: enable the doctest from within a doctest lxml.html.usedoctest: enable the doctest, using the HTML parser lxml.html: * lxml.html.HtmlMixin, defining on each element: - remove_element: element removes itself from a tree - remove_tag: element removes itself but not its children from a tree - find_rel_links: find <a rel="?"> - find_class: find <* class="?"> * HTML: parser * parse_elements: parse fragment, return list of elements * parse_element: parse fragment, return single element * Element: apparently a highly broken element factory (segfaults?!) * tostring: HTML serialization lxml.defs: lists of HTML tags (e.g., block_tags) lxml.clean: clean Javascript and other problem code from HTML lxml.rewritelinks: change the links in a document lxml.htmldiff: make human-readable diffs and blame reports The usedoctest modules are based on a really horrible hack. It seems to work, except for some reason lxml/html/tests/test_clean.txt is sometimes run without the doctest change. The other doctests aren't run like this, and when you explicitly run the test (e.g., python test.py test_clean) it runs fine. So something weird with the test runner, I guess. -- Ian Bicking | ianb(a)colorstudy.com | http://blog.ianbicking.org | Write code, do good | http://topp.openplans.org/careers

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[lxml-dev] Network downloading of schemas should be off by default?
by Itamar Shtull-Trauring June 3, 2007

June 3, 2007

Right now, AFAICT, is is on by default in lxml.etree.XMLParser. Network queries by library code are a bad idea: it's an unexpected behavior, causing potential security risk and guaranteed performance problems. -- Itamar Shtull-Trauring http://itamarst.org

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