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Wed Nov 16 23:18:51 EST 2016 · https://mail.python.org/pipermail/python-dev/2016-November/146832.html

Didn't 3.5 have to roll an extra last minute RC for an emergency
abi-breaking bug fix, though? (Thinking of the windows runtime stuff.)

On Nov 16, 2016 7:51 PM, "Nick Coghlan" <ncoghlan at gmail.com> wrote:

> On 17 November 2016 at 10:44, Steve Dower <steve.dower at python.org> wrote:
> > On 16Nov2016 1618, Ned Batchelder wrote:
> >> Am I doing the wrong thing by using PyCodeObject fields directly in the
> >> coverage.py C trace function?  It seems like this was an unnecessary
> >> breaking change, even if it is a non-guaranteed interface.
> >
> > I suspect the "wrong thing" here is expecting to not see any changes
> between
> > alpha/beta versions. It certainly should not change within 3.6.x, so your
> > wheel build will be fine, but changing during the prerelease versions is
> a
> > possibility for anything not in the limited ABI.
>
> Right, and we don't have an explicit policy on when the ABI gets
> locked prior to the x.y.0 release other than the general rule of
> "minimise change after the first release candidate".
>
> This question also came up on the wheel-builders list in the context
> of "When can Python 3.6 support be added to the published manylinux1
> build environments without risking ABI incompatible wheels on final
> release?".
>
> Perhaps it would make sense to declare the final beta the last
> opportunity for public ABI changes? That would give folks a few weeks
> to start preparing launch binaries if they want to do so, rather than
> the single week planned between the rc and the final release.
>
> Cheers,
> Nick.
>
> --
> Nick Coghlan   |   ncoghlan at gmail.com   |   Brisbane, Australia
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[Python-Dev] Recent changes to PyCodeObject