No Numpy newaxis slicing support about h5py HOT 3 OPEN

I am not sure that this is something we want to support as it is doing an implicit reshape as part of the read. I would expect:

    return F[array_group][:][:,np.newaxis,:,:]

would would and I think is clearer ("Please read the whole data set" and then "please resahpe it by sticking an extra axis in").

from h5py.

I agree. I wonder if we should check for None earlier (e.g. in __getitem__) and raise a more helpful error?

from h5py.

@aragilar I don't really see how to improve the current message. Admittedly it may not be obvious to every user that np.newaxis is an alias to None, which might cause some confusion, but I don't think we can distinguish the two variables at runtime (precisely because they're really the same object). Maybe we could special case None so that np.newaxis in mentionned in the error message ?

from h5py.