[Zope-dev] zope.component: calling an Interface and calling queryAdapter give differing results

[Philipp von Weitershausen]

El 9 Sep 2008, a las 20:37 , Dieter Maurer escribió:
> Chris Withers wrote at 2008-9-8 18:34 +0100:
>> ...
>>> There's the backward-compatibility issue, which is a showstopper.
>>> There's plenty of code that does this:
>>>
>>>    adapter = package.interfaces.IFoo(object, None)
>>>
>>> Changing the signature as you describe would break all code that  
>>> does this.
>>
>> How about a new major revision of zope.interface then?
>
> I fear that would be a bit drastic -- for a mostly cosmetic change.

I agree.

> But interfaces might grow an additional method, e.g. "adapt",
> which could get the new signature.
>
> The syntax would be a bit more cumbersome -- but on the other
> hand, it would be more explicit :-)

I don't think it would be too cumbersome. While IMHO elegant, the  
current syntax of calling an interface to adapt isn't actually self- 
explanatory. I've frequently observed people tripping over this,  
specially when you have an IFoo interface and a Foo class -- which is  
quite common --, then IFoo(obj) and Foo(obj) differ only by one  
character. With your suggestion, it would be IFoo.adapt(obj) vs.  
Foo(obj), making the difference quite obvious.

So overall I'm +1