[issue24379] Add operator.subscript as a convenience for creating slices

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Raymond, adding a stub element to __slots__ fixes a leak. Is this enough to push the patch again?

We should open a separate issue for leaks in objects with empty __slots__.

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