[issue31333] Implement ABCMeta in C

[Ivan Levkivskyi]

Ivan Levkivskyi added the comment:

Eric,

> the only ABCs in importlib are in importlib.abc (and used by importlib.util).
> This does not impact interpreter startup.

Hm, indeed, but I see that module 'abc' is in 'sys.modules', probably it is then only used by 'collections.abc'/'_collections_abc'. This means that the influence of 'ABCMeta' on interpreter start-up time will be smaller than I thought. But still start-up times for projects that actively use ABCs will be influenced by 'ABCMeta'.

But what do you think about making private ABC caches read-only attributes? (They are not documented)

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<http://bugs.python.org/issue31333>
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