DRY and static attribute for multiple classes.

Hi all,
I want to provide an encapsulated static attribute called _registry
for several classes.

I try to use inheritance in order to make it DRY: all classes inherit
from a BaseClass that implements the _registry encapsulation. But with
inheritance it doesn't work how I want, because a single instance of
the _registry is shared between all of the inherited classes, and I
want to have an independent _registry for every class.

How can I do that without coping all the code in every class?

Many Thanks!!
--
Marc

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