[Numpy-discussion] Revised NEP-18, __array_function__ protocol

[Stephan Hoyer]

On Thu, Jun 28, 2018 at 5:36 PM Eric Wieser <wieser.eric+numpy at gmail.com>
wrote:

> Another option would be to directly compare the methods against known ones:
>
> obj = func.__self__
> if isinstance(obj, np.ufunc):
>     if func is obj.reduce:
>         got_reduction()
>
> I'm not quite sure why, but this doesn't seem to work with current ufunc
objects:

>>> np.add.reduce == np.add.reduce  # OK
True

>>> np.add.reduce is np.add.reduce  # what?!?
False

Maybe this is a bug? There's been some somewhat related discussion recently
on python-dev:
https://mail.python.org/pipermail/python-dev/2018-June/153959.html
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