[Numpy-discussion] backwards compatibility and deprecation policy NEP

Ralf Gommers ralf.gommers at gmail.com
Sun Jul 22 15:03:05 EDT 2018

On Sat, Jul 21, 2018 at 7:25 PM, Nathaniel Smith <njs at pobox.com> wrote:

> On Sat, Jul 21, 2018 at 5:46 PM, Hameer Abbasi
> <einstein.edison at gmail.com> wrote:
> > The possibility of another major version change (possibly the same one)
> > where we re-write all portions that were agreed upon (via NEPs) to be
> > re-written, with a longer LTS release (3 years? 5?).
> >
> > I’m thinking this one could be similar to the Python 2 -> Python 3
> > transition. Note that this is different from having constant breakages,
> this
> > will be a mostly one-time effort and one-time breakage.
> I agree that this approach should probably be discussed in the NEP,
> specifically in the "rejected alternatives" section. It keeps coming
> up, and the reasons why it doesn't work for numpy are not obvious, so
> well-meaning people will keep bringing it up. It'd be helpful to have
> a single authoritative place to link to explaining why we don't do
> things that way.

good idea, will do

> The beginning of the NEP should maybe also state up front that we
> follow a rolling-deprecations model where different breaking changes
> happen simultaneously on their own timelines. It's so obvious to me
> that I didn't notice it was missing, but this is a helpful reminder
> that it's not obvious to everyone :-).

Hmm, indeed. It is that obvious to us, but clearly not to people who are
new to NumPy/Python. Will add.

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