Message113790
@abstractmethod
@classmethod
def ...
doesn't work because classmethod objects doesn't have a __dict__, so setting arbitrary attributes don't work, and abstractmethod tries to set the __isabstractmethod__ atribute to True.
The other order:
@classmethod
@abstractmethod
def ...
doesn't work, because the abstractmethod decorator sets the function's __isabstractmethod__ attribute to True, but when ABCMeta.__new__ checks the object in the namespace of the class, it won't find it, because the classmethod object won't have an __isabstractmethod__ attribute.
The situation is the same with staticmethod.
One possible solution would be adding a descriptor to classmethod (and staticmethod), with the name "__isabstractmethod__", which on __get__ would check its underlying callable for this attribute, and on __set__ would set this attribute on that callable. I think this way both order should work. |
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Date |
User |
Action |
Args |
2010-08-13 15:57:49 | daniel.urban | set | recipients:
+ daniel.urban, terry.reedy, della |
2010-08-13 15:57:48 | daniel.urban | set | messageid: <1281715068.86.0.782835998014.issue5867@psf.upfronthosting.co.za> |
2010-08-13 15:57:47 | daniel.urban | link | issue5867 messages |
2010-08-13 15:57:47 | daniel.urban | create | |
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