Mailman 3 March 2008 - lxml - The Python XML Toolkit

[lxml-dev] XSLT extension elements landed on trunk
by Stefan Behnel 02 Mar '08

02 Mar '08

Hi, the current trunk now has support for Python implemented XSLT extension elements. It's sort of a sandbox environment with read-only Elements, where you can do basically anything based on the stylesheet and the input document, and then append some result subtree to the XSLT output tree. Here's a short XSLT snippet that uses an extension, and a Python class that provides such an extension: <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:myns="testns" extension-element-prefixes="myns"> <xsl:template match="a"> <A> <myns:myext><x>X</x><y>Y</y><z/></myns:myext> </A> </xsl:template> </xsl:stylesheet> class MyExt(etree.XSLTExtension): def execute(self, context, self_node, input_node, output_parent): # apply templates to my own children and process the result for child in self_node: for result in self.apply_templates(context, child): if isinstance(result, basestring): el = etree.Element("T") el.text = result else: el = result output_parent.append(el) I don't remember when I first started thinking about this, but it was actually pretty hard to get right until now. I uploaded some docs to the dev site: http://codespeak.net/lxml/dev/xpathxslt.html#extension-elements Note that this is currently an experimental feature that will go into lxml 2.1. Any comments and bug reports will be very much appreciated. Have fun, Stefan

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[lxml-dev] Segfault and bus error when importing lxml.html.clean after importing webbrowser
by Jon Rosebaugh 01 Mar '08

01 Mar '08

I was trying to use lxml.html.clean to sanitize comments in my blog. Unfortunately, although I can import and use it in a standalone console session, it fails within the webapp. Sometimes it segfaults, and sometimes it's a bus error instead. After going through all the imports to see what _they_ imported, I finally tracked down a minimal example that can cause the problem: import webbrowser import lxml.html.clean If I reverse the order of imports, everything works fine, so for the moment I've worked around it by making sure that lxml.html.clean is imported the very first thing. I have lxml compiled from the 2.0 tgz from the site, libxml2 2.6.31 and libxslt 1.1.22 installed via macports (both the latest versions macports has), Cython 0.9.6.11 installed, and I'm using Python 2.5.1 as downloaded from python.org for OS X. Here's the crash log Mac OS X provides: Process: Python [82702] Path: /Library/Frameworks/Python.framework/Versions/2.5/Resources/Python.app/Contents/MacOS/Python Identifier: Python Version: ??? (???) Code Type: X86 (Native) Parent Process: bash [188] Date/Time: 2008-02-02 00:05:49.472 -0600 OS Version: Mac OS X 10.5.1 (9B18) Report Version: 6 Exception Type: EXC_BAD_ACCESS (SIGBUS) Exception Codes: KERN_PROTECTION_FAILURE at 0x0000000000000005 Crashed Thread: 0 Thread 0 Crashed: 0 libxml2.2.dylib 0x91cda419 xmlDictLookup + 360 1 libxml2.2.dylib 0x00d78728 xmlXPathCompExprAdd + 280 2 libxml2.2.dylib 0x00d84e0c xmlXPathCompStep + 1004 3 libxml2.2.dylib 0x00d85812 xmlXPathCompRelativeLocationPath + 98 4 libxml2.2.dylib 0x00d86235 xmlXPathCompPathExpr + 1973 5 libxml2.2.dylib 0x00d86c35 xmlXPathCompUnaryExpr + 213 6 libxml2.2.dylib 0x00d86e3f xmlXPathCompMultiplicativeExpr + 15 7 libxml2.2.dylib 0x00d8702f xmlXPathCompAdditiveExpr + 15 8 libxml2.2.dylib 0x00d8717f xmlXPathCompRelationalExpr + 15 9 libxml2.2.dylib 0x00d8732f xmlXPathCompEqualityExpr + 15 10 libxml2.2.dylib 0x00d8748f xmlXPathCompAndExpr + 15 11 libxml2.2.dylib 0x00d87602 xmlXPathCompileExpr + 18 12 libxml2.2.dylib 0x00d868ec xmlXPathCompPathExpr + 3692 13 libxml2.2.dylib 0x00d86c35 xmlXPathCompUnaryExpr + 213 14 libxml2.2.dylib 0x00d86e3f xmlXPathCompMultiplicativeExpr + 15 15 libxml2.2.dylib 0x00d8702f xmlXPathCompAdditiveExpr + 15 16 libxml2.2.dylib 0x00d8717f xmlXPathCompRelationalExpr + 15 17 libxml2.2.dylib 0x00d8732f xmlXPathCompEqualityExpr + 15 18 libxml2.2.dylib 0x00d8748f xmlXPathCompAndExpr + 15 19 libxml2.2.dylib 0x00d87602 xmlXPathCompileExpr + 18 20 libxml2.2.dylib 0x00d87872 xmlXPathCompPredicate + 194 21 libxml2.2.dylib 0x00d84d4e xmlXPathCompStep + 814 22 libxml2.2.dylib 0x00d85812 xmlXPathCompRelativeLocationPath + 98 23 libxml2.2.dylib 0x00d86235 xmlXPathCompPathExpr + 1973 24 libxml2.2.dylib 0x00d86c35 xmlXPathCompUnaryExpr + 213 25 libxml2.2.dylib 0x00d86e3f xmlXPathCompMultiplicativeExpr + 15 26 libxml2.2.dylib 0x00d8702f xmlXPathCompAdditiveExpr + 15 27 libxml2.2.dylib 0x00d8717f xmlXPathCompRelationalExpr + 15 28 libxml2.2.dylib 0x00d8732f xmlXPathCompEqualityExpr + 15 29 libxml2.2.dylib 0x00d8748f xmlXPathCompAndExpr + 15 30 libxml2.2.dylib 0x00d87602 xmlXPathCompileExpr + 18 31 libxml2.2.dylib 0x00d8c6ca xmlXPathCtxtCompile + 90 32 etree.so 0x00bdc1d7 __pyx_pf_4lxml_5etree_5XPath___init__ + 551 (lxml.etree.c:79217) 33 org.python.python 0x00448981 type_call + 166 (typeobject.c:436) 34 org.python.python 0x003f9278 PyObject_Call + 45 (abstract.c:1860) 35 org.python.python 0x00480851 PyEval_EvalFrameEx + 9242 (ceval.c:3775) 36 org.python.python 0x00484cdc PyEval_EvalCodeEx + 1819 (ceval.c:2831) 37 org.python.python 0x00484e90 PyEval_EvalCode + 87 (ceval.c:500) 38 org.python.python 0x0049bcbe PyImport_ExecCodeModuleEx + 193 (import.c:669) 39 org.python.python 0x0049c114 load_source_module + 726 (import.c:953) 40 org.python.python 0x0049cd9b import_submodule + 293 (import.c:2394) 41 org.python.python 0x0049cfe9 load_next + 195 (import.c:2214) 42 org.python.python 0x0049d4dd import_module_level + 213 (import.c:2002) 43 org.python.python 0x0049d98d PyImport_ImportModuleLevel + 45 (import.c:2066) 44 org.python.python 0x00478917 builtin___import__ + 156 (bltinmodule.c:49) 45 org.python.python 0x003f9278 PyObject_Call + 45 (abstract.c:1860) 46 org.python.python 0x0047d5b2 PyEval_CallObjectWithKeywords + 112 (ceval.c:3433) 47 org.python.python 0x00481464 PyEval_EvalFrameEx + 12333 (ceval.c:2063) 48 org.python.python 0x00484cdc PyEval_EvalCodeEx + 1819 (ceval.c:2831) 49 org.python.python 0x00484e90 PyEval_EvalCode + 87 (ceval.c:500) 50 org.python.python 0x004a7cf2 PyRun_InteractiveOneFlags + 460 (pythonrun.c:1271) 51 org.python.python 0x004a7f2e PyRun_InteractiveLoopFlags + 85 (pythonrun.c:723) 52 org.python.python 0x004a86da PyRun_AnyFileExFlags + 155 (pythonrun.c:690) 53 org.python.python 0x004b5bb6 Py_Main + 3077 (main.c:523) 54 org.python.python 0x00001f8e 0x1000 + 3982 55 org.python.python 0x00001eb5 0x1000 + 3765 Thread 0 crashed with X86 Thread State (32-bit): eax: 0x009d0bd4 ebx: 0x91cda2c2 ecx: 0x00000004 edx: 0x0000e3d0 edi: 0x00000005 esi: 0x00000005 ebp: 0xbfffd428 esp: 0xbfffd3f0 ss: 0x0000001f efl: 0x00010202 eip: 0x91cda419 cs: 0x00000017 ds: 0x0000001f es: 0x0000001f fs: 0x00000000 gs: 0x00000037 cr2: 0x00000005 Binary Images: 0x1000 - 0x1fff +org.python.python 2.5a0 (2.5alpha0) /Library/Frameworks/Python.framework/Versions/2.5/Resources/Python.app/Contents/MacOS/Python 0xea000 - 0xebfff +cStringIO.so ??? (???) /Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/lib-dynload/cStringIO.so 0x3f0000 - 0x4e4fc3 +org.python.python 2.5a0 (2.5) /Library/Frameworks/Python.framework/Versions/2.5/Python 0x7f4000 - 0x7f5ffb +select.so ??? (???) /Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/lib-dynload/select.so 0x900000 - 0x926fdf +readline.so ??? (???) /Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/lib-dynload/readline.so 0x93e000 - 0x96ffe7 +libncurses.5.dylib ??? (???) /Library/Frameworks/Python.framework/Versions/2.5/lib/libncurses.5.dylib 0x98b000 - 0x98dfff +collections.so ??? (???) /Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/lib-dynload/collections.so 0x99a000 - 0x99bfff +fcntl.so ??? (???) /Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/lib-dynload/fcntl.so 0x9e3000 - 0x9e6ffb +_struct.so ??? (???) /Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/lib-dynload/_struct.so 0x9f4000 - 0x9f5ff3 +time.so ??? (???) /Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/lib-dynload/time.so 0xb00000 - 0xb02fff +binascii.so ??? (???) /Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/lib-dynload/binascii.so 0xb0d000 - 0xb0e073 +icglue.so ??? (???) /Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/lib-dynload/icglue.so 0xb1c000 - 0xb1ffff +strop.so ??? (???) /Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/lib-dynload/strop.so 0xb2c000 - 0xb2ffff +_Res.so ??? (???) /Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/lib-dynload/_Res.so 0xb3e000 - 0xb44fff +_File.so ??? (???) /Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/lib-dynload/_File.so 0xb63000 - 0xb64ffd +MacOS.so ??? (???) /Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/lib-dynload/MacOS.so 0xbb5000 - 0xc67ff9 +etree.so ??? (???) <9f2b581810d292f482356b73a83969f9> /Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/lxml-2.0-py2.5-macosx-10.3-fat.egg/lxml/etree.so 0xcdd000 - 0xd09fff +libxslt.1.dylib ??? (???) /opt/local/lib/libxslt.1.dylib 0xd13000 - 0xd1ffff +libexslt.0.dylib ??? (???) /opt/local/lib/libexslt.0.dylib 0xd25000 - 0xe27fef +libxml2.2.dylib ??? (???) /opt/local/lib/libxml2.2.dylib 0xe59000 - 0xe69ffd +libz.1.dylib ??? (???) /opt/local/lib/libz.1.dylib 0xe6e000 - 0xf65ff0 +libiconv.2.dylib ??? (???) /opt/local/lib/libiconv.2.dylib 0xfd2000 - 0xfd4fff +operator.so ??? (???) /Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/lib-dynload/operator.so 0xfdf000 - 0xfe2fff +itertools.so ??? (???) /Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/lib-dynload/itertools.so 0x8fe00000 - 0x8fe2d883 dyld 95.3 (???) <81592e798780564b5d46b988f7ee1a6a> /usr/lib/dyld 0x9029d000 - 0x902f6fff libGLU.dylib ??? (???) /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGLU.dylib 0x902f7000 - 0x906b5fea libLAPACK.dylib ??? (???) /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libLAPACK.dylib 0x906b6000 - 0x907fbff7 com.apple.ImageIO.framework 2.0.0 (2.0.0) <154d4d8cda2bd99518cbabc9f2d69833> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ImageIO.framework/Versions/A/ImageIO 0x907fc000 - 0x9080affd libz.1.dylib ??? (???) <5ddd8539ae2ebfd8e7cc1c57525385c7> /usr/lib/libz.1.dylib 0x908b7000 - 0x908b7fff com.apple.Carbon 136 (136) <98a5e3bc0c4fa44bbb09713bb88707fe> /System/Library/Frameworks/Carbon.framework/Versions/A/Carbon 0x908c8000 - 0x908ccfff libGIF.dylib ??? 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(???) <8ecc83dc0399be3946f7a46e88cf4bbb> /usr/lib/libSystem.B.dylib 0x91346000 - 0x91350feb com.apple.audio.SoundManager 3.9.2 (3.9.2) <0f2ba6e891d3761212cf5a5e6134d683> /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/CarbonSound.framework/Versions/A/CarbonSound 0x91c34000 - 0x91c3afff com.apple.print.framework.Print 218 (220) <c35172175abbe554ddadd9b6401351fa> /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/Print.framework/Versions/A/Print 0x91c3b000 - 0x91c51fff com.apple.DictionaryServices 1.0.0 (1.0.0) <ad0aa0252e3323d182e17f50defe56fc> /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/DictionaryServices.framework/Versions/A/DictionaryServices 0x91c52000 - 0x91c6dffb libPng.dylib ??? 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(???) <d468bc4a8a69343f1748c293db1b57fb> /usr/lib/libauto.dylib 0x93d61000 - 0x94067fff com.apple.HIToolbox 1.5.0 (???) <1b872a7151ee3f80c9c736a3e46d00d9> /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox 0x94080000 - 0x94147ff2 com.apple.vImage 3.0 (3.0) /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vImage.framework/Versions/A/vImage 0x94196000 - 0x941a6ffc com.apple.LangAnalysis 1.6.4 (1.6.4) <cbeb17ab39f28351fe2ab5b82bf465bc> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/LangAnalysis.framework/Versions/A/LangAnalysis 0x941a7000 - 0x94226ff5 com.apple.SearchKit 1.2.0 (1.2.0) <277b460da86bc222785159fe77e2e2ed> /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/SearchKit.framework/Versions/A/SearchKit 0x94227000 - 0x942d9ffb libcrypto.0.9.7.dylib ??? 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(???) /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libBLAS.dylib 0x949ee000 - 0x94a4aff7 com.apple.htmlrendering 68 (1.1.3) <fe87a9dede38db00e6c8949942c6bd4f> /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HTMLRendering.framework/Versions/A/HTMLRendering 0x94a51000 - 0x94f1dffe libGLProgrammability.dylib ??? (???) <e8bc0af671427cf2b6279a035805a086> /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGLProgrammability.dylib 0x94f1f000 - 0x94f79ff7 com.apple.CoreText 2.0.0 (???) <7fa39cd5bc847615ec02e7c7a37c0508> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/CoreText.framework/Versions/A/CoreText 0x94f7a000 - 0x95143fef com.apple.security 5.0.1 (32736) <8c9eda0fcc1d8a571543025ac900715f> /System/Library/Frameworks/Security.framework/Versions/A/Security 0x95156000 - 0x957edfef com.apple.CoreGraphics 1.351.0 (???) <7a6f399039eed6dbe845c169f7d21a70> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/CoreGraphics.framework/Versions/A/CoreGraphics 0x957ee000 - 0x957fbfe7 com.apple.opengl 1.5.5 (1.5.5) <aa08b52d2a84b44dc6ee5d544a53fe8a> /System/Library/Frameworks/OpenGL.framework/Versions/A/OpenGL 0x95808000 - 0x95820fff com.apple.openscripting 1.2.6 (???) <b8e553df643f2aec68fa968b3b459b2b> /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/OpenScripting.framework/Versions/A/OpenScripting 0x95835000 - 0x958b1feb com.apple.audio.CoreAudio 3.1.0 (3.1) <70bb7c657061631491029a61babe0b26> /System/Library/Frameworks/CoreAudio.framework/Versions/A/CoreAudio 0x958b2000 - 0x958b5fff com.apple.help 1.1 (36) <b507b08e484cb89033e9cf23062d77de> /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/Help.framework/Versions/A/Help 0x95ab6000 - 0x95ab8ff5 libRadiance.dylib ??? (???) <20eadb285da83df96c795c2c5fa20590> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ImageIO.framework/Versions/A/Resources/libRadiance.dylib 0x95ab9000 - 0x95abbfff com.apple.securityhi 3.0 (30817) <2b2854123fed609d1820d2779e2e0963> /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/SecurityHI.framework/Versions/A/SecurityHI 0x95b66000 - 0x95babfef com.apple.Metadata 10.5.0 (398) <4fd74fba0062c2e08ec4b1c10b40ff63> /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/Metadata.framework/Versions/A/Metadata 0x95bac000 - 0x95c3eff3 com.apple.ApplicationServices.ATS 3.0 (???) <fb5f572243dbc370a0ea5efc8e81ae11> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ATS.framework/Versions/A/ATS 0x95c3f000 - 0x95c9cffb libstdc++.6.dylib ??? (???) <04b812dcec670daa8b7d2852ab14be60> /usr/lib/libstdc++.6.dylib 0x95f3d000 - 0x95f8dff7 com.apple.HIServices 1.6.0 (???) <d74aa73e4cfd30a08fb169198a8d2539> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/HIServices.framework/Versions/A/HIServices 0x96083000 - 0x96116fff com.apple.ink.framework 101.3 (86) <bf3fa8927b4b8baae92381a976fd2079> /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/Ink.framework/Versions/A/Ink 0x9642d000 - 0x96463fff com.apple.SystemConfiguration 1.9.0 (1.9.0) <7919d9588c3b0d556646e555b7193f1f> /System/Library/Frameworks/SystemConfiguration.framework/Versions/A/SystemConfiguration 0x96483000 - 0x965bbff7 libicucore.A.dylib ??? (???) <afcea652ff2ec36885b2c81c57d06d4c> /usr/lib/libicucore.A.dylib 0x96782000 - 0x967fcff8 com.apple.print.framework.PrintCore 5.5 (245) <9441d178f4b430cf92b67bf346646693> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/PrintCore.framework/Versions/A/PrintCore 0x96835000 - 0x9685cfff libcups.2.dylib ??? (???) <5521498e8902ddd0b15cfaa7db384e29> /usr/lib/libcups.2.dylib 0x9685d000 - 0x96897ff7 com.apple.coreui 0.1 (60) /System/Library/PrivateFrameworks/CoreUI.framework/Versions/A/CoreUI 0x96898000 - 0x9689ffe9 libgcc_s.1.dylib ??? (???) <f53c808e87d1184c0f9df63aef53ce0b> /usr/lib/libgcc_s.1.dylib 0x968a4000 - 0x968abffe libbsm.dylib ??? (???) <d25c63378a5029648ffd4b4669be31bf> /usr/lib/libbsm.dylib 0x968ea000 - 0x96c80ff7 com.apple.QuartzCore 1.5.1 (1.5.1) <deb61cbeb3f734a1b2f4669f6268b9de> /System/Library/Frameworks/QuartzCore.framework/Versions/A/QuartzCore 0x96c81000 - 0x96ca5fff libxslt.1.dylib ??? (???) <4933ddc7f6618743197aadc85b33b5ab> /usr/lib/libxslt.1.dylib 0x96ca6000 - 0x96caefff com.apple.DiskArbitration 2.2 (2.2) <1551b2af557fdf6f368f93e093933852> /System/Library/Frameworks/DiskArbitration.framework/Versions/A/DiskArbitration 0x96caf000 - 0x96cafffd com.apple.Accelerate 1.4 (Accelerate 1.4) /System/Library/Frameworks/Accelerate.framework/Versions/A/Accelerate 0x96cb0000 - 0x96d24fef libvMisc.dylib ??? (???) /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libvMisc.dylib 0x96d68000 - 0x96da5ff7 libGLImage.dylib ??? (???) <202d73e6a4688fc06ff11b71910c2ce7> /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGLImage.dylib 0x96dd6000 - 0x96dd7fef libmathCommon.A.dylib ??? (???) /usr/lib/system/libmathCommon.A.dylib 0x96dd8000 - 0x96f0afe7 com.apple.CoreFoundation 6.5 (476) <8bfebc0dbad6fc33bea0fa00a1b9ec37> /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation 0x96f0b000 - 0x96f14fff com.apple.speech.recognition.framework 3.7.24 (3.7.24) <d3180f9edbd9a5e6f283d6156aa3c602> /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/SpeechRecognition.framework/Versions/A/SpeechRecognition 0xfffe8000 - 0xfffebfff libobjc.A.dylib ??? (???) /usr/lib/libobjc.A.dylib 0xffff0000 - 0xffff1780 libSystem.B.dylib ??? (???) /usr/lib/libSystem.B.dylib

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[lxml-dev] Setting URL from lxml.html.fromstring, etc
by Ian Bicking 01 Mar '08

01 Mar '08

There doesn't seem to be any way to set a document's URL when parsing the document. E.g.: >>> from lxml import html >>> tree = html.parse('http://www.python.org') >>> tree.docinfo.URL 'http://www.python.org' But the parse function doesn't really take any arguments, and the URL attribute is write-only. Ideally you could do fromstring('...doc...', URL='location'). (Also I'm not sure why the URL shouldn't be writable.) Ian

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