[issue38290] cleanup ababstractproperty in typing.py

[hongweipeng]

Change by hongweipeng <hongweichen8888 at sina.com>:


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keywords: +patch
pull_requests: +16011
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/16432

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38290>
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