The implementation of abstractclassmethod abc.py in Python 3.4 looks like this:
class abstractclassmethod(classmethod):
__isabstractmethod__ = True
def __init__(self, callable):
callable.__isabstractmethod__ = True
super().__init__(callable)
The answer for Python 2.7 Combine abc.abstractmethod and classmethod is based on this implementation.
Why is it necessary to set __isabstractmethod__ on the callable? Wouldn't it be enough to set the class variable __isabstractmethod__ of class abstractclassmethod? Which use case would not work, if the whole __init__() definition would be removed (like in abstractproperty)?
