[Numpy-discussion] [API] (minor change) Allow multiple axes in `expand_dims`

[Sebastian Berg]

Hi all,

Pull request 14051:

https://github.com/numpy/numpy/pull/14051

means that `np.expand_dims` now accepts multiple axes in the `axis`
argument. As before, the axis signal where a new axis is in the output
array. From the new tests:

a = np.empty((3, 3, 3))
np.expand_dims(a, axis=(0, 1, 2)).shape == (1, 1, 1, 3, 3, 3)
np.expand_dims(a, axis=(0, -1, -2)).shape == (1, 3, 3, 3, 1, 1)
np.expand_dims(a, axis=(0, 3, 5)).shape == (1, 3, 3, 1, 3, 1)
np.expand_dims(a, axis=(0, -3, -5)).shape == (1, 1, 3, 1, 3, 3)

We believe this is an uncontroversial generalization, but pinging the
mailing list since it is an API change. If anyone is concerned please I
will be happy to revert, otherwise this is expected to be included in
1.18.

Cheers,

Sebastian
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