[Numpy-discussion] copy="never" discussion and no deprecation cycle?

Charles R Harris charlesr.harris at gmail.com
Sun Jun 20 21:53:45 EDT 2021

On Fri, Jun 18, 2021 at 8:52 AM Stefan van der Walt <stefanv at berkeley.edu>

> On Thu, Jun 17, 2021, at 16:23, Stephan Hoyer wrote:
> This happens all the time. Even if we make copy='never' an error *today*,
> users will be encountering existing versions of NumPy for years into the
> future, so we won't be able to change the behavior of copy='never' for a
> very long time. Our deprecation policy says we would need to wait at least
> one year for this, but frankly I'm not sure that's enough for
> the possibility of silent bugs. 3-4 years might be more realistic.
> If we go the enum route, we may just as well deprecate string arguments at
> the same time so that we have the flexibility to introduce them again in
> the future.
> Stéfan
What if we made `copy=False` do what it says. I always thought the
ambiguous behavior was just asking for trouble. For a couple of releases we
could raise a FutureWarning when a copy was made in spite of `copy=False`,
which might expose some bugs in existing code.

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