Mailman 3 January 2016 - lxml - The Python XML Toolkit

Building lxml statically for MeVisLab
by Corvus Corax 21 Jan '16

21 Jan '16

Hi, I'm trying to build lxml for MeVisLab 2.7 on Windows 7 x64. Therefore I'm using the Python 2.7 delivered with MeVisLab and MS Visual Studio 2013 Professional. As my workplace is behind a proxy I had to configure the setup.py and buildlibxml.py to use the already downloaded libraries. How I did this is described in the appended build-changes.txt. So when trying to build lxml it fails with the output in build.log. It looks like it's trying to rebuild lxml.etree, but does it even have to? Would you please help me with this? I don't know what to do from here on. Sincerely, Corbie

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a question about odd behaviour of 'break' in an lxml loop with iterchildren and itersiblings
by Martin Mueller 15 Jan '16

15 Jan '16

I am puzzled by the following behaviour of lxml. I want to group element children with the same tag. Here is a schematic representation of my text: <sp xml:id="sp-0645"> <speaker xml:id="spk-0645"/> <ab xml:id="ftln-0645" n="2.1.1"/> <ab xml:id="ftln-0646" n="2.1.2"/> <ab xml:id="ftln-0647" n="2.1.3"/> <ab xml:id="ftln-0648" n="2.1.4"/> <stage/> <ab xml:id="ftln-0703" n="2.1.59"/> <ab xml:id="ftln-0704" n="2.1.60"/> <stage/> <ab xml:id="ftln-0705" n="2.1.61"/> </sp> I want to end up with something like : <sp xml:id="sp-0645"> <speaker xml:id="spk-0645"/> <lb xml:id="ftln-0645" n="2.1.1"/> <lb xml:id="ftln-0646" n="2.1.2"/> <lb xml:id="ftln-0647" n="2.1.3"/> <lb xml:id="ftln-0648" n="2.1.4"/> <stage/> <lb xml:id="ftln-0703" n="2.1.59"/> <lb xml:id="ftln-0704" n="2.1.60"/> <stage/> <lb xml:id="ftln-0705" n="2.1.61"/> </sp> I try to do this through a combination of iterchildren() and itersiblings() and use the following script: speech = 'speech.xml' tree = etree.parse(speech) for sp in tree.iter('sp'): for child in sp.iterchildren(): if child.tag != 'ab': print('child', child.tag) for sibling in child.itersiblings(): if sibling.tag == 'ab': print('sibling'. sibling.tag) else: break The output of this script suggests that the two loops work properly: child speaker sibling ab sibling ab sibling ab sibling ab child stage sibling ab sibling ab child stage sibling ab Now I complicate things by creating a paragraph element with each child element. The printout shows that each of the paragraphs exists and that after the break statement the program returns to the top child loop: child speaker sibling ab sibling ab sibling ab sibling ab else <Element p at 0x1014cb548> child stage sibling ab sibling ab else <Element p at 0x1014cb508> child stage sibling ab elif <Element p at 0x1014cb608> But if I now add code to the script that fills the created paragraphs with ab elements, the program does this correctly for the first iteration but then it exits. Here is the code and the result: speech = 'speech.xml' tree = etree.parse(speech) for sp in tree.iter('sp'): for child in sp.iterchildren(): if child.tag != 'ab': paragraph = etree.Element('p') print('child', child.tag) for sibling in child.itersiblings(): if sibling.tag == 'ab' and sibling.getnext()is not None: print('sibling', sibling.tag) paragraph.append(sibling) elif sibling.tag == 'ab' and sibling.getnext() is None: print('sibling', sibling.tag) paragraph.append(sibling) print('elif', etree.tostring(paragraph, encoding='unicode', pretty_print=True)) else: print('else',etree.tostring(paragraph, encoding='unicode', pretty_print=True)) Break child speaker sibling ab sibling ab sibling ab sibling ab else <ab xml:id="ftln-0645" n="2.1.1"/> <ab xml:id="ftln-0646" n="2.1.2"/> <ab xml:id="ftln-0647" n="2.1.3"/> <ab xml:id="ftln-0648" n="2.1.4"/> Why does the program execute only the first iteration of the loop and exit completely after the 'break', when it doesn't do that in the structurally identical but simpler versions?

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a question about iter
by Martin Mueller 15 Jan '16

15 Jan '16

Is there a way of telling etree to iterate only over the immediate children of an element? I know I can do it by enumerating the elements that occur as chid element. In my particular case, it would be simpler if I could exclude elements, as in "cycle through everything except 'w', 'c', and 'pc'. On But it would be more elegant to say "cycle through the elements just one level below the current element". Is that possible? One possibility might be to use the getchildren() function, but I'm not sure whether that's the best way.

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help
by balavignesh 10 Jan '16

10 Jan '16

I am trying to build lxml package from the following link https://pypi.python.org/packages/source/l/lxml/lxml-3.5.0.tar.gz#md5=9f0c5f… using pypy. *$ pypy setup.py build* I run this pypy in a virtualenv. I am using pypy 4.0.1 and lxml 3.5.0. The build fails with the following error: cc -O2 -fPIC -Wimplicit -I/usr/include/libxml2 -Isrc/lxml/includes -I/root/venv/pypy/include -c src/lxml/lxml.etree.c -o build/temp.linux-x86_64-2.7/src/lxml/lxml.etree.o -w src/lxml/lxml.etree.c: In function '__Pyx_call_return_trace_func': src/lxml/lxml.etree.c:4323:13: error: 'PyThreadState' has no member named 'tracing' tstate->tracing++; ^ src/lxml/lxml.etree.c:4324:13: error: 'PyThreadState' has no member named 'use_tracing' tstate->use_tracing = 0; ^ src/lxml/lxml.etree.c:4325:33: error: 'PyThreadState' has no member named 'c_tracefunc' if (CYTHON_TRACE && tstate->c_tracefunc) ^ src/lxml/lxml.etree.c:4326:17: error: 'PyThreadState' has no member named 'c_tracefunc' tstate->c_tracefunc(tstate->c_traceobj, frame, PyTrace_RETURN, result); ^ src/lxml/lxml.etree.c:4326:37: error: 'PyThreadState' has no member named 'c_traceobj' tstate->c_tracefunc(tstate->c_traceobj, frame, PyTrace_RETURN, result); ^ src/lxml/lxml.etree.c:4326:58: error: 'PyTrace_RETURN' undeclared (first use in this function) tstate->c_tracefunc(tstate->c_traceobj, frame, PyTrace_RETURN, result); ^ src/lxml/lxml.etree.c:4326:58: note: each undeclared identifier is reported only once for each function it appears in src/lxml/lxml.etree.c:4327:17: error: 'PyThreadState' has no member named 'c_profilefunc' if (tstate->c_profilefunc) ^ src/lxml/lxml.etree.c:4328:17: error: 'PyThreadState' has no member named 'c_profilefunc' tstate->c_profilefunc(tstate->c_profileobj, frame, PyTrace_RETURN, result); ^ src/lxml/lxml.etree.c:4328:39: error: 'PyThreadState' has no member named 'c_profileobj' tstate->c_profilefunc(tstate->c_profileobj, frame, PyTrace_RETURN, result); and this error goes on for thousands of lines. I tried googling this error and I came across this link : https://bitbucket.org/pypy/pypy/issues/1185/cpyext-missing-members-in-pythr… I am not sure if this is the same issue as mine. Any help would be appreciated. *Note*: This lxml package is successfully built using python 2.7, 3.2, 3.4. Thank you. -- Regards, *Balavignesh S*

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