[Python-Dev] cffi in stdlib

[Nick Coghlan]

On 18 Dec 2013 06:21, "Maciej Fijalkowski" <fijall at gmail.com> wrote:
>
> On Tue, Dec 17, 2013 at 7:21 PM, Brett Cannon <brett at python.org> wrote:
> > Maybe someone from PyPy should bring this up as an official topic at the
> > language summit to figure out the blockers (again). Or it can join
regex on
> > the list of "module discussed for addition at the language summit but
never
> > quite pushed to commitment". =)
>
> we're still working on resolving discussed issues before officially
> proposing it for inclusion.

Note that there's also now a link chain from the CPython extension creation
docs to cffi (and Cython) - the cross version Python Packaging User Guide
now has a section on binary extensions that covers several of the
alternatives to writing them by hand, while the stdlib extension writing
guide has a note at the beginning pointing to that resource.

Cheers,
Nick.

>
> >
> >
> > On Tue, Dec 17, 2013 at 11:43 AM, Stefan Krah <stefan at bytereef.org>
wrote:
> >>
> >> Maciej Fijalkowski <fijall at gmail.com> wrote:
> >> > I would like to discuss on the language summit a potential inclusion
> >> > of cffi[1] into stdlib. This is a project Armin Rigo has been working
> >> > for a while, with some input from other developers.
> >>
> >> I've tried cffi (admittedly only in a toy script) and find it very nice
> >> to use.
> >>
> >> Here's a comparison (pi benchmark) between wrapping libmpdec using a
> >> C-extension (_decimal), cffi and ctypes:
> >>
> >>
> >> +-------------------------------+----------+----------+---------+
> >> |                               | _decimal |  ctypes  |   cffi  |
> >> +===============================+==========+==========+=========+
> >> | cpython-tip (with-system-ffi) |   0.19s  |   5.40s  |  5.14s  |
> >> +-------------------------------+----------+----------+---------+
> >> | cpython-2.7 (with-system-ffi) |    n/a   |   4.46s  |  5.18s  |
> >> +-------------------------------+----------+----------+---------+
> >> |      Ubuntu-cpython-2.7       |    n/a   |   3.63s  |    -    |
> >> +-------------------------------+----------+----------+---------+
> >> |      pypy-2.2.1-linux64       |    n/a   |  125.9s  |  0.94s  |
> >> +-------------------------------+----------+----------+---------+
> >> |     pypy3-2.1-beta1-linux64   |    n/a   |  264.9s  |  2.93s  |
> >> +-------------------------------+----------+----------+---------+
> >>
> >>
> >> I guess the key points are that C-extensions are hard to beat and that
> >> cffi performance on pypy-2 is outstanding. Additionally it's worth
noting
> >> that Ubuntu does something in their Python build that we should do,
too.
> >>
> >>
> >> +1 for cffi in the stdlib.
> >>
> >>
> >>
> >> Stefan Krah
> >>
> >>
> >>
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> >
> >
> >
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