[Python-ideas] check interfaces, isducktype(X, A)

[Gregory Salvan]

>
> It's covered in the inspect module docs:
>
> Oups, I've missed it was introduced in v3.3


> I'd be open to an "abc.invalidate_caches()" function as a
>
more obvious way to force cache invalidation.
>

Does this implementation make sense ?
https://gist.github.com/apieum/7805431
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