Remove multiple inheritance in Python 3000

[Diez B. Roggisch]

> I have a couple issues with this, though I wholeheartedly agree with
> the sentiment:
> 
> 1. Java didn't grow interfaces, they were there from the start.

I might have expressed myself wrong here - I should have written "needed 
to introduce interfaces (right from the start)"

> 2. Java interfaces solve a different problem than MI (used properly)
> does: interfaces are there to make types polymorphic, whereas
> inheritance's main use is to share behavior.

But the *goal* of the polymorphy is mainly to have shared behavior. And 
matter of factly e.g. in swing, you use inner classes that implement 
most of the behavior you want, and override the few points where you 
want differences - and then clumsily delegate to that inner class all 
your interface-methods.

Diez