[Numpy-discussion] is __array_ufunc__ ready for prime-time?

[Stephan Hoyer]

On Mon, Nov 6, 2017 at 2:29 PM Ryan May <rmay31 at gmail.com> wrote:

> On Mon, Nov 6, 2017 at 3:18 PM, Chris Barker <chris.barker at noaa.gov>
> wrote:
>
>> Klunky, and maybe we could come up with a standard way to do it and
>> include that in numpy, but I'm not sure that ABCs are the way to do it.
>>
>
> ABCs are *absolutely* the way to go about it. It's the only way baked into
> the Python language itself that allows you to register a class for purposes
> of `isinstance` without needing to subclass--i.e. duck-typing.
>
> What's needed, though, is not just a single ABC. Some thought and design
> needs to go into segmenting the ndarray API to declare certain behaviors,
> just like was done for collections:
>
> https://docs.python.org/3/library/collections.abc.html
>
> You don't just have a single ABC declaring a collection, but rather "I am
> a mapping" or "I am a mutable sequence". It's more of a pain for developers
> to properly specify things, but this is not a bad thing to actually give
> code some thought.
>

I agree, it would be nice to nail down a hierarchy of duck-arrays, if
possible. Although, there are quite a few options, so I don't know how
doable this is. Any interest in opening up an issue on GitHub to discuss?
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