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1 point by ndanger 5881 days ago | link | parent

It sounds like Python's abstract base classes ( & mix-ins (which is, INMHO a good idea for Python, I haven't used Arc enough to judge).

1 point by almkglor 5881 days ago | link

"Abstract Base Class" also happens to be the term preferred in C++ for Haskell's "type class" and Java's "interface". So it probably is-a python abstract base class ^^.

That said the problem with using a "base" class with an inheritance model is that it's deucedly difficult to think in terms of multiple inheritance (multiple inheritance is so hard most languages don't use it). Mix-ins help ameliorate this by being a has-a relationship.