Callable or not callable, that is the question!

Ian Kelly ian.g.kelly at gmail.com
Fri Jul 12 09:11:02 CEST 2013


On Thu, Jul 11, 2013 at 8:12 PM, Steven D'Aprano
<steve+comp.lang.python at pearwood.info> wrote:
> On Thu, 11 Jul 2013 15:05:59 +0200, Ulrich Eckhardt wrote:
>
>> Hello!
>>
>> I just stumbled over a case where Python (2.7 and 3.3 on MS Windows)
>> fail to detect that an object is a function, using the callable()
>> builtin function. Investigating, I found out that the object was indeed
>> not callable, but in a way that was very unexpected to me:
> [...]
>>      X.test2[0]() # TypeError: 'staticmethod' object is not callable
>>
>>
>> Bug or feature?
>
> In my opinion, a bug. I thought I had actually submitted it to the bug
> tracker, but apparently I was a shameful slacker and did not. However
> there was a discussion in this thread:
>
> http://mail.python.org/pipermail/python-dev/2011-March/109090.html
>
>
> Here's a simpler demonstration of the issue:
>
> assert callable(staticmethod(lambda: None))

If staticmethod is going to be callable then classmethod should be
callable also.



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