[issue24379] slice.literal notation

[Mark Dickinson]

Mark Dickinson added the comment:

For prior art, it's worth taking a look at NumPy, and in particular its `s_` and `index_exp` functions:

>>> import numpy as np
>>> np.s_[1:2]
slice(1, 2, None)
>>> np.s_[0]
0
>>> np.s_[1:2, 3]
(slice(1, 2, None), 3)

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nosy: +mark.dickinson

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<http://bugs.python.org/issue24379>
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