[issue40566] Apply PEP 573 to abc module

[Dong-hee Na]

Dong-hee Na <donghee.na92 at gmail.com> added the comment:

I am now closing the issue. Thanks for the review

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nosy: +christian.heimes
resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40566>
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