[Interface-dev] Twisted switch progress report

[Jim Fulton]

Martijn Faassen wrote:
> Jim Fulton wrote:
> 
>> Itamar Shtull-Trauring wrote:
> 
> 
>>>
>>> 3. Currently implements is indicated like this:
>>>
>>> class Bar:
>>>    __implements__ = IFoo, IBar
>>>
>>> I have some code in adapter registration backwards compat layer that
>>> converts this to the correct way. The problem is with subclasses:
>>>
>>> class Sub(Bar):
>>>    __implements__ = Bar.__implements__ + (ISub,)
>>>
>>> If Bar changes to implements(), Sub will break. In the interest of
>>> backwards compat, could I change the implements() class' __add__ and
>>> __radd__ to handle tuples and interface objects? With a deprecation
>>> warning of course.
> 
> 
> Does this affect my changes on zope.interface at all?

Hm, I guess it does.

I missread Itamar's note. I thought he was getting rid of the __implements__
usages. Hm.

 > I renamed
> __implements__ to __implemented__ as it's an implementation detail, to 
> avoid clashes with Zope 2.
> 
> I'm also thinking about ripping out the backwards compatibility code 
> which deals with public __implemented__ out.

Yes, please

Itamar,

Your fixup code should make __implements__ a descriptor that calls
implementedBy.

Jim

-- 
Jim Fulton           mailto:jim at zope.com       Python Powered!
CTO                  (540) 361-1714            http://www.python.org
Zope Corporation     http://www.zope.com       http://www.zope.org