[Python-Dev] (some) C99 added to PEP 7

[Chris Barker]

On Thu, Sep 8, 2016 at 9:17 AM, Benjamin Peterson <benjamin at python.org>
wrote:

> > Does this mean that we might be able to have the built-in integer be
> > based
> > on int64_t now? so Windows64 and *nix64 will be the same?
>
> The builtin integer type (in Python 3) is variable length.
>

indeed it is -- py2.7 also??

That's why I said "based on" -- under the hood, a C type is used, and IIUC,
that type has been "long" for ages. And a long on Windows 64 (with the MS
 compiler anyway) is 32 bit, and a long on *nix (with the gnu compilers, at
least) is 64 bits.

This doesn't expose itself to pure python (and sys.maxint is now gone) but
it does get exposed in the C API, and in particular, when passing data back
and forth between numpy and pure python (numpy doesn't support an unlimited
integer like python), or working with buffers or bytearrays, or whatever in
Cython.

Perhaps this is now a non-issue in py3 -- I honestly have not done any
"real" computation work with py3 yet, but it sure is in 2.7

-CHB


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