- class ClassName(MainClass, Mixin1, Mixin2, ...): # Used to declare a class with the name ClassName, main (first) class MainClass, and mixins Mixin1, Mixin2, etc.
- class ClassName(Mixin1, MainClass, Mixin2, ...): # The 'main' class doesn't have to be the first class; there's really no difference between it and the mixin
Adding a mixin to a class looks a lot like adding a superclass, because it pretty much is just that. An object of a class with the mixin Foo will also be an instance of Foo, and
isinstance(instance, Foo) will return true