On Fri, Aug 29, 2008 at 6:15 PM, Nick Coghlan <ncoghlan@gmail.com> wrote:
The mixin methods in the ABC machinery would be a lot less useful without multiple inheritance (and the collections ABCs would be a whole lot harder to define and to write).
So if you're looking for use cases for multiple inheritance, I'd suggest starting with the Python 2.6 collections module and seeing how you would go about rewriting it using only single inheritance. I believe the new io module is also fairly dependent on multiple inheritance.
I am very well aware of the collection module and the ABC mechanism. However, you are missing that mixins can be implemented in a single-inheritance world without the complications of the MRO. See my answer to Alex Martelli in this same thread.