Mailman 3 June 2008 - lxml - The Python XML Toolkit

[lxml-dev] Patch for xpathgrep.py
by Thomas Schraitle 09 Jun '08

09 Jun '08

Hi, although I haven't wrote on this mailinglist yet, I read it regularly and like lxml very much! Thanks for all the hard work that went into this library! :-) To improve it a bit, I've created a humble patch against xpathgrep.py. I've looked at it and I missed a namespace option. Well, here it is. See the attached patch. Hope it's ok, feel free to adapt it to your needs. Keep up the excellent work! Thanks, Tom

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[lxml-dev] Pickling objectified trees
by Christian Zagrodnick 09 Jun '08

09 Jun '08

Hi, the other day I had to pickle objectified trees. I just thought to share my findings. Pickling is about serialization. IMHO the natural serialization of an objectified tree is its XML representation. So the following basically does that: -------------------------- import copy_reg import lxml.etree import lxml.objectify def treeFactory(state): """Un-Pickle factory.""" return lxml.objectify.fromstring(state) copy_reg.constructor(treeFactory) def reduceObjectifiedElement(object): """Reduce function for lxml.objectify trees. See http://docs.python.org/lib/pickle-protocol.html for details. """ return (treeFactory, (lxml.etree.tostring(object), )) copy_reg.pickle(lxml.objectify.ObjectifiedElement, reduceObjectifiedElement, treeFactory) ----------------------------------------- You might consider just registering the reduce function in lxml itself. Shouldn't hurt, should it. -- 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] confused newbie ;-)
by Chris Withers 08 Jun '08

08 Jun '08

Hi Guys, I've finally come around to trying out lxml2, so I googled for it and ended up here: http://codespeak.net/lxml/index.html#download I got myself in a bit of know 'cos I didn't realise the pointer to PyPI was a link (I could have sworn I hovered over it and got no link, but I see now that it is). So I went to http://pypi.python.org/pypi and searched for lxml. This returns a link to version 0.9. This is what really threw me... well, once I found out there was a version 2.1beta2 available! I guess my main questions are: - Why are there no links from http://pypi.python.org/pypi/lxml/0.9 to http://pypi.python.org/pypi/lxml? - Why is 0.9 being returned as the only relevent search result? - How come http://pypi.python.org/pypi/lxml returns a list with no other information, versus say http://pypi.python.org/pypi/mailinglogger, which returns the docs and a list of versions? cheers, Chris PS: I did also try using easy_install, but that sucked down 2.1beta2 and then whined that there was no C compiler. How can I teach easy_install that I only want eggs where there is already a windows binary? -- Simplistix - Content Management, Zope & Python Consulting - http://www.simplistix.co.uk

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Re: [lxml-dev] xpath comparison
by Olivier Collioud 06 Jun '08

06 Jun '08

Thanks Stefan, But I would have expected that: def isin(context,symbol,start,end): return start <= symbol <= end ns = ElementTree.FunctionNamespace('http://wipo.int/isin') ns.prefix = 'ii' ns['isin'] = isin for mref in definitionsTree.xpath('//MREF[ii:isin(%s,@START,@END)]' % symbol): ... would be faster than: for mref in definitionsTree.xpath('//MREF'): if mref.get('START') <= symbol <= mref.get('END'): ... Because the first solution should visit less node. But it seems that it is the contrary. Why ? Olivier >>> Stefan Behnel <stefan_ml(a)behnel.de> 6/06/08 11:08 am >>> Olivier Collioud wrote: > is there any xpath equivalent in lxml to this: > > (ms:string-compare(@START,$symbol)=-1 and > ms:string-compare(@END,$symbol)=1) > > which mean: > > (START < symbol and symbol < END) You can implement your own python function to do this. http://codespeak.net/lxml/extensions.html Stefan _______________________________________________ lxml-dev mailing list lxml-dev(a)codespeak.net http://codespeak.net/mailman/listinfo/lxml-dev ------ World Intellectual Property Organization Disclaimer: This electronic message may contain privileged, confidential and copyright protected information. If you have received this e-mail by mistake, please immediately notify the sender and delete this e-mail and all its attachments. Please ensure all e-mail attachments are scanned for viruses prior to opening or using.

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Re: [lxml-dev] first lessons learned while porting lxml to Py3
by Stefan Behnel 06 Jun '08

06 Jun '08

Hi, Martijn Faassen wrote: > Looks like > thanks to the use of Cython, porting to Python 3 while remaining > compatible with Python 2.x actually is easier than if it'd been plain > Python. That's actually a nice migration path: "sorry, this pure Python module is currently only available as a C extension for Python3, due to incompatible syntax changes in the Python language." ;) Stefan

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Re: [lxml-dev] Forced attribute value escaping
by Stefan Behnel 06 Jun '08

06 Jun '08

Hi, please keep the list in CC. RommeDeSerieux wrote: > #! /usr/bin/env python > ## vim: fileencoding=utf-8 > from lxml import etree > > node = etree.Element(u'tag_тег') > node.attrib[u'attribute_атрибут'] = u'value_значение' > node.text = u'text_текст' > > # what i'm getting (with some linebreaks for email): > # <tag_тег attribute_атрибут="value_зна > # чение">text_текст > # </tag_тег> > # > # expected result: > # <tag_тег attribute_атрибут="value_значение">text_текст > # </tag_тег> > print etree.tostring(node, encoding='utf-8') Yep, the serialisation is done by libxml2, so if you feel that this should look different, please file a bug report over there, or report it on their mailing list. http://xmlsoft.org/bugs.html Stefan

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[lxml-dev] Forced attribute value escaping
by RommeDeSerieux 06 Jun '08

06 Jun '08

Why does lxml insist on encoding non-ascii characters in attribute values as xml entities while leaving the text nodes, tag names and attribute names intact? How do i turn it off?

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[lxml-dev] xpath comparison
by Olivier Collioud 06 Jun '08

06 Jun '08

Hello, is there any xpath equivalent in lxml to this: (ms:string-compare(@START,$symbol)=-1 and ms:string-compare(@END,$symbol)=1) which mean: (START < symbol and symbol < END) ? Regards, Olivier. ------ World Intellectual Property Organization Disclaimer: This electronic message may contain privileged, confidential and copyright protected information. If you have received this e-mail by mistake, please immediately notify the sender and delete this e-mail and all its attachments. Please ensure all e-mail attachments are scanned for viruses prior to opening or using.

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[lxml-dev] segfault when using etree.CustomElementClassLookup
by Martijn Faassen 05 Jun '08

05 Jun '08

Hi there, I just ran into a segfault with lxml (2.0.6). The problem is as follows: from lxml import etree class Lookup(etree.CustomElementClassLookup): def __init__(self): pass def lookup(self, node_type, document, namespace, name): return Foo class Foo(etree.ElementBase): def custom(self): return "test" lookup = Lookup() parser = etree.XMLParser() parser.setElementClassLookup(lookup) root = etree.XML('<foo/>', parser) # crash! If I leave out the custom __init__ in Lookup, things won't crash. Regards, Martijn

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[lxml-dev] svn version failed to compiled against hg version of cython
by Kevin JR 05 Jun '08

05 Jun '08

libxslt-1.1.24 libxml2-2.6.32 python-2.5.2 cython-hg(482) the error message: $ python setup.py build Building lxml version 2.1.beta3-55506. Building with Cython 0.9.6.14. Using build configuration of libxslt 1.1.24 Building against libxml2/libxslt in the following directory: /usr/lib running build running build_py running build_ext cythoning src/lxml/lxml.etree.pyx to src/lxml/lxml.etree.c Error converting Pyrex file to C: ------------------------------------------------------------ ... c_attr = c_attr.next return attributes cdef object __RE_XML_ENCODING __RE_XML_ENCODING = re.compile( ur'^(\s*<\?\s*xml[^>]+)\s+encoding\s*=\s*"[^"]*"\s*', re.U) ^ ------------------------------------------------------------ /dev/shm/python-lxml/src/lxml-build/src/lxml/apihelpers.pxi:487:6: Expected ')'

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