[Python-Dev] Dinamically set __call__ method

Ethan Furman ethan at stoneleaf.us
Sun Nov 9 21:16:17 CET 2014


On 11/09/2014 03:38 AM, Gregory Ewing wrote:
> Ethan Furman wrote:
>>
>> And the thing going on is the normal python behavior (in __getattribute__, I believe) of examining the returned
>> attribute to see if it is a descriptor, and if so invoking it.
>
> Only if you look it up through the instance, though.
> Normally, if you look up an attribute on a class,
> the descriptor protocol doesn't get triggered.

Hrmm, maybe we're not talking about the same thing.  I was responding to your comment:

> (BTW, I'm actually surprised that this technique makes c callable.
> There must be more going on that just "look up __call__ in the class
> object", because evaluating C.__call__ just returns the descriptor
> and doesn't invoking the descriptor mechanism.)

which seems to clash with what you just said.

--
~Ethan~



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