ellipsis in python as index

1#The ellipsis is used in numpy to slice higher-dimensional data structures.
2#It's designed to mean at this point, insert as many full slices (:) 
3#to extend the multi-dimensional slice to all dimensions. so e.g.
4a = np.zeros((3,3,3))
5a[::, 0]
6#gives the same as
7a[..., 0]