abc.abstractclassmethod()

@abc.abstractclassmethod

A subclass of the built-in classmethod(), indicating an abstract classmethod. Otherwise it is similar to abstractmethod().

This special case is deprecated, as the classmethod() decorator is now correctly identified as abstract when applied to an abstract method:

class C(metaclass=ABCMeta):
    @classmethod
    @abstractmethod
    def my_abstract_classmethod(cls, ...):
        ...