[Numpy-discussion] NEP 21: Simplified and explicit advanced indexing

[Robert Kern]

On Tue, Jun 26, 2018 at 1:26 AM Travis Oliphant <teoliphant at gmail.com>
wrote:

> I like the proposal generally.  NumPy could use a good orthogonal indexing
> method and a vectorized-indexing method is fine too.
>
> Robert Kern is spot on with his concerns as well.  Please do not change
> what arr[idx] does except to provide warnings and perhaps point people to
> new .oix and .vix methods.  What indexing does is documented (if hard to
> understand and surprising in a particular sub-case).
>
> There is one specific place in the code where I would make a change to
> raise an error rather than change the order of the axes of the output to
> provide a consistent subspace.  Even then, it should be done as a
> deprecation warning and then raise the error.
>
> Otherwise, just add the new methods and don't make any other changes until
> a major release.
>

I'd suggest that the NEP explicitly disclaim deprecating current behavior.
Let the NEP just be about putting the new features out there. Once we have
some experience with them for a year or three, then let's talk about
deprecating parts of the current behavior and make a new NEP then if we
want to go that route. We're only contemplating *long* deprecation cycles
anyways; we're not in a race. The success of these new features doesn't
really rely on the deprecation of current indexing, so let's separate those
issues.

-- 
Robert Kern
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