[Numpy-discussion] edge-cases of ellipsis indexing

[Antony Lee]

While trying to reproduce various fancy indexings for astropy's FITS
sections (a loaded-on-demand array), I found the following interesting
behavior:

>>> np.array([1])[..., 0]
array(1)
>>> np.array([1])[0]
1
>>> np.array([1])[(0,)]
1

The docs say "Ellipsis expand to the number of : objects needed to make a
selection tuple of the same length as x.ndim.", so it's not totally clear
to me how to explain that difference in the results.

Antony
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