I've always been told that multiple inheritance is a bad thing, so I've tried to avoid. I didn't dig into why its a problem. I've recently come across a use of multiple inheritance in some python ...

Multiple interface inheritance still allows an object to inherit methods and to behave polymorphically on those methods. The inheriting object just doesn’t get an implementation free ride.

To quote Bjarne Stroustrup, "Multiple inheritance is like a parachute. Most of the time you don't need it, but when you do need it, you really need it." In the early days of C++, before templates ...