>>> a = np.random.rand(3, 4, 5)
>>> a[0, :, 0]
array([ 0.48054702, 0.88728858, 0.83225113, 0.12491976])
>>> a[(0, slice(None), 0)]
array([ 0.48054702, 0.88728858, 0.83225113, 0.12491976])
:5 -> slice(5)
1:5 -> slice(1, 5)
1: -> slice(1, None)
1::2 -> slice(1, None, 2)
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