[issue44803] change tracemalloc.BaseFilter to an abstract class

[Łukasz Langa]

Łukasz Langa <lukasz at 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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