[Python-Dev] clarification: subset vs equality Re: [Python-checkins] peps: Draft of PEP 399: Pure Python/C Accelerator Module Compatibiilty Requirements (original) (raw)

Brett Cannon brett at python.org
Wed Apr 6 19:06:30 CEST 2011

On Tue, Apr 5, 2011 at 06:10, Jim Jewett <jimjjewett at gmail.com> wrote:

On 4/4/11, brett.cannon <python-checkins at python.org> wrote: > Draft of PEP 399: Pure Python/C Accelerator Module Compatibiilty > Requirements

> +Abstract > +======== > + > +The Python standard library under CPython contains various instances > +of modules implemented in both pure Python and C. This PEP requires > +that in these instances that both the Python and C code must be > +semantically identical (except in cases where implementation details > +of a VM prevents it entirely). It is also required that new C-based > +modules lacking a pure Python equivalent implementation get special > +permissions to be added to the standard library. I think it is worth stating explicitly that the C version can be even a strict subset. It is OK for the accelerated C code to rely on the common python version; it is just the reverse that is not OK.

I thought that was obvious, but I went ahead and tweaked the abstract and rationale to make this more explicit. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.python.org/pipermail/python-dev/attachments/20110406/751eb8ff/attachment.html>

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