[Numpy-discussion] np.{bool,float,int} deprecation

[Mark Harfouche]

I guess if the answer is to stop people from

from numpy import *

there is a good fix for that doesn’t involve deprecating dtype=np.int.

If the answer is to deprecate

np.int(1) == int(1)

then one can add a warning to the __init__ of the np.int class, but
continue to subclass the python int class.

It just doesn’t seem worthwhile to to stop people from using dtype=np.int,
which seem to read:

“I want this to be a numpy integer, not necessarily a python integer”.

On Sat, Dec 5, 2020 at 10:14 PM Charles R Harris <charlesr.harris at gmail.com>
wrote:

>
>
> On Sat, Dec 5, 2020 at 4:31 PM Juan Nunez-Iglesias <jni at fastmail.com>
> wrote:
>
>> Hi all,
>>
>> At the prodding [1] of Sebastian, I’m starting a discussion on the
>> decision to deprecate np.{bool,float,int}. This deprecation broke our
>> prerelease testing in scikit-image (which, hooray for rcs!), and resulted
>> in a large amount of code churn to fix [2].
>>
>> To be honest, I do think *some* sort of deprecation is needed, because
>> for the longest time I thought that np.float was what np.float_ actually
>> is. I think it would be worthwhile to move to *that*, though it’s an even
>> more invasive deprecation than the currently proposed one. Writing `x =
>> np.zeros(5, dtype=int)` is somewhat magical, because someone with a strict
>> typing mindset (there’s an increasing number!) might expect that this is an
>> array of pointers to Python ints. This is why I’ve always preferred to
>> write `dtype=np.int`, resulting in the current code churn.
>>
>> I don’t know what the best answer is, just sparking the discussion
>> Sebastian wants to see. ;) For skimage we’ve already merged a fix (even if
>> it is one of dubious quality, as Stéfan points out [3] ;), so I don’t have
>> too much stake in the outcome.
>>
>> Juan.
>>
>> [1]:
>> https://github.com/scikit-image/scikit-image/pull/5103#issuecomment-739334463
>> [2]: https://github.com/scikit-image/scikit-image/pull/5103
>> [3]:
>> https://github.com/scikit-image/scikit-image/pull/5103#issuecomment-739368765
>>
>
> I checked pandas and astropy and both have several uses of the deprecated
> types but should be easy to fix. I suppose the question is if we want to
> make them fix things *right now* :)
>
> Chuck
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