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

[Ivan Levkivskyi]

Ivan Levkivskyi added the comment:

Serhiy, thank you for review! Here is a corrected patch.

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Added file: http://bugs.python.org/file45473/operator_subscript_norefleak_v2.patch

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