New submission from Géry <gery.o...@gmail.com>:

This P.R. will make the following changes to the `collections.abc` module:

- simplify the implementation with slicing in function `Sequence.index`.
- remove an unnecessary copy of `self` when a sequence extends itself in 
function `MutableSequence.extend`.

----------
components: Library (Lib)
messages: 416415
nosy: maggyero
priority: normal
pull_requests: 30285
severity: normal
status: open
title: Improve the implementations of Sequence.index and MutableSequence.extend 
in collections.abc
type: enhancement
versions: Python 3.10, Python 3.11, Python 3.9

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue47178>
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