[issue34331] Incorrectly pluralized abstract class error message

[Sanyam Khurana]

Sanyam Khurana <sanyam.khurana01 at gmail.com> added the comment:

Adding 3.9 to this bug. I've reviewed the PR and it looks good to me.

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nosy: +CuriousLearner
versions: +Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34331>
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