Łukasz Langa <luk...@langa.pl> added the comment:

Many standard libraries, including new ones like asyncio, use `raise 
NotImplementedError` to denote methods that need re-implementation in 
subclasses. Some of those base classes even literally *called* Abstract and yet 
don't inherit from ABC (nor use ABCMeta). Do you intend to change all those as 
well?

While I agree it would be cleaner to have them defined as abstract, at the 
moment I'm not sure it's worth the churn.

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nosy: +lukasz.langa

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<https://bugs.python.org/issue44803>
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