[Python-Dev] Dinamically set __call__ method

Ethan Furman ethan at stoneleaf.us
Sat Nov 8 20:49:17 CET 2014

On 11/07/2014 10:50 PM, dieter wrote:
> Ethan Furman <ethan at stoneleaf.us> writes:
>> On 11/06/2014 10:59 PM, dieter wrote:
>>> John Ladasky writes:
>>>> On Tuesday, November 4, 2014 11:12:31 AM UTC-8, Ethan Furman wrote:
>>>>> If you really absolutely positively have to have the signature be correct for each instance, you may to either look at a
>>>>> function creating factory, a class creating factory, or a meta-class.
>>>> +1.  Overriding __call__() within the class definition, over and over again, with different function, looks awkward to me.
>>> A possibility to get the original approach implemented looks like:
>>>     make "__call__" a descriptor on the class which looks up the real
>>>     method on the instance.
>> This still wouldn't get the signatrue correct, though.
> Why not? Once the descriptor is resolved, you get the final
> instance method - with the correct signature.

Hmmm... well, it wouldn't be correct on a class lookup, but, yeah, it would be correct for an instance lookup -- and 
maybe that's good enough for the OP.


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