[Numpy-discussion] New Indexing Methods Revival #N (subclasses!)

[Marten van Kerkwijk]

Hi Nathan,

The question originally posed is whether `ndarray` should provide that
single method as a convenience already, even though it doesn't
actually use it itself. Do you think that is useful, i.e., a big
advantage over overwriting the new oindex, vindex, and another that I
forget?

My own feeling is that while it is good to provide some hooks for
subclasses (__array_prepare__, wrap, finalize, numpy_ufunc), this one
is too fine-grained and the benefits do not outweigh the cost,
especially since it could easily be done with a mixin (unlike those
other cases, which are not used to cover ndarray methods, but rather
numpy functions, i.e., they provide subclasses with hooks into those
functions, which no mixin could possibly do).

All the best,

Marten