[Types-sig] Re: PRE-PROPOSAL: Python Interfaces

[Jim Fulton]

This discussion should move to the types-sig, types-sig@python.org,
http://www.python.org/sigs/types-sig/.  I am cross posting to the
types sig.  Replies to this message should be posted to
types-sig@python.org and *not* to comp.lang.python.

Paul Prescod wrote:
> 
> This is almost identical to what we decided to implement at the
> conference. The only catch is that __class_protocols__ is called
> __interfaces__ and it is a list of interface objects. An interface object
> looks a lot like a class (because we are using existing Python syntax
> features) but it is conceptually a class with no implementation.

Actually, in my mind (and current implementation) it's actual and
conceptual connection to a class is pretty tenuous.  Asside from being 
created with a class statement, it doesn't look much like a class.
Interfaces are not classes and can't be subclassed with classes.
 
Jim

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