[Python-Dev] why different between staticmethod and classmethod on non-callable object?

[Benjamin Peterson]

2009/9/1 Brett Cannon <brett at python.org>:
> On Tue, Sep 1, 2009 at 07:21, Benjamin Peterson<benjamin at python.org> wrote:
>> 2009/8/31 xiaobing jiang <s7v7nislands at gmail.com>:
>>> My idea is: here, the two functions (or maybe classes) should have the
>>> same behavior).
>>> so is this a bug or something I missing ?
>>
>> I think they should both not check their arguments in __init__ to
>> allow for duck typing.
>
> But what is the point of wrapping something with classmethod or
> staticmethod that can't be called? It isn't like it is checking
> explicitly for a function or method, just that it can be called which
> seems reasonable to me (unless PyCallable_Check() is as off as
> callable() was).

Well, if checking if tp_call is not NULL is as bad as callable, then yes.

I don't see any reason to use staticmethod or classmethod with a
non-callable, but to be consistent, I would, given the choice between
removing code and adding another type check, perfer to remove a type
check.



-- 
Regards,
Benjamin