Needed: Real-world examples for Python's Cooperative Multiple Inheritance

[Ethan Furman]

Raymond Hettinger wrote:
> I'm writing-up more guidance on how to use super() and would like to
> point at some real-world Python examples of cooperative multiple
> inheritance.

Don't know if you are still looking for examples, but I recently came 
across a thread in Python-Dev which had an example using unittest:

Ricardo Kirkner wrote [much snippage]:
 > I'll give you the example I came upon:
 >
 > I have a TestCase class, which inherits from both Django's TestCase
 > and from some custom TestCases that act as mixin classes. So I have
 > something like
 >
 > class MyTestCase(TestCase, Mixin1, Mixin2):
 >    ...
 >
 > Since I explicitely base off 3 classes, I expected all 3
 > classes to be initialized, and I expect the setUp method to be called
 > on all of them.

As written this example failed because TestCase (from django) was based 
on unittest2.TestCase, which was not calling super.  I understand, 
however, that if the mixins were listed before TestCase that it would work.

Hope this helps.

~Ethan~