Guido wrote a blog entry about interfaces versus ABC in Python.
Nice to see the discussion about this point occurring. Note he's taking into
account the fact that Zope3 and Twisted do have an actual interface
implementation (which is the ZopeInterface BTW)
As a Zope3 developer I just hope he will go for core Python interfaces
(Post originally written by Julien Anguenot on the old Nuxeo blogs.)