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Martin Aspeli wrote:
> Dieter Maurer wrote:
>>> - It's an explicit declaration of support
>> As is the definition of "__of__".
> Well, not in a formal sense. I could have some non-Zope python object
> that I wanted to register as a local utility (to override a global one,
> say) that could have __of__() for some other reason.
That would be an "empty set": '__of__' is a slot which only Zope's
ExtensionClasses define; it isn't used by "non-Zope python objects".
> IAcquirer is an explicit, formalised statement of support for some
> particular behaviour.
It is a latecomer to the game, and doesn't seem "superior" to a "duck
typing" check, at least to me.
> I doubt it matters in this case (I'd guess __of__() is not a very common
> method name outside Zope, and this would be pretty localised code), but
> in general, having code be conditional on hasattr() something can lead
> to spaghetti code and unintended side effects.
Checking for an '__of__' on an about-to-be-returned attribute is
*exactly* what ExtensionClass already does inside an attribute access;
I'd say let's follow suit, rather than invent an otherwise-irrelevant
Or, to paraphrase the Beatles: "All you need is __of__ ... DAH dah,
dadda dum... __of__ is all you need."
Tres Seaver +1 540-429-0999 [EMAIL PROTECTED]
Palladion Software "Excellence by Design" http://palladion.com
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