[pypy-dev] Bringing Cython and PyPy closer together

Maciej Fijalkowski fijall at gmail.com
Sat Feb 18 10:35:24 CET 2012

On Sat, Feb 18, 2012 at 11:27 AM, Stefan Behnel <stefan_ml at behnel.de> wrote:
> Amaury Forgeot d'Arc, 18.02.2012 10:08:
>> 2012/2/18 Stefan Behnel
>>> Stefan Behnel, 15.02.2012 12:32:
>>>> http://wiki.cython.org/enhancements/pypy
>>> So, any volunteers or otherwise interested parties to help in getting this
>>> to work? Anyone in for financial support?
>> Actually I spent several evenings on this.
>> I made some modifications to pypy, cython and lxml,
>> and now I can compile and install cython, lxml, and they seem to work!
>> For example::
>>     html = etree.Element("html")
>>     body = etree.SubElement(html, "body")
>>     body.text = "TEXT"
>>     br = etree.SubElement(body, "br")
>>     br.tail = "TAIL"
>>     html.xpath("//text()")
>> Here are the changes I made, some parts are really hacks and should be
>> polished:
>> lxml: http://paste.pocoo.org/show/552903/
>> cython: http://paste.pocoo.org/show/552904/
>> pypy changes are already submitted.
> Cool. Most of the changes look reasonable at first glance. I'll see what I
> can apply on my side. We may get at least some of this into Cython 0.16
> (which is close to release).
>> As expected, the example above is much slower on pypy, about 15x slower
>> than with cpython2.6.
> Given that XML processing is currently slower in PyPy than in CPython, I
> don't think that's all that bad. Users can still switch their imports to
> ElementTree if they only want to push XML out and I imagine that lxml would
> still be at least as fast as ElementTree under PyPy for the way in.

Are you sure actually?

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