PEP 245: Python interfaces

[Scottie]

The one further thing I'd like to see is a way to declare that a class
implements an interface without having to edit either the interface
or the class -- Imagine the situation where I obtain two packages,
and I want to tell the one package that it can accept objects from
the other.

I am otherwise quite pleased by the proposal.  Perhaps a useful
part of thePEP would be a "File" interface, to provide a nice
concrete definition of a "file-like object."

-Scott David Daniels