Author links to the PEP-3119 containing the new, correct way to do things. And then explains how to do it the old way? The right way to do this is with @abc.ab

Author links to the PEP-3119 containing the new, correct way to do things. And then explains how to do it the old way? The right way to do this is with @abc.abstractmethod decorator. https://docs.python.org/3/library/abc.html#abc.abstractmethod https://docs.python.org/3/library/abc.html#abc.abstractmetho...