Python Abstract Attribute

I will only have a single Abstract Class in this particular module and so I'm trying to avoid importing the 'ABC' package. See below for my attempt and the issue I'm running into.

Solution 1:

You're expecting each child class to have self.requirements right? So change the following code to this.

classEvent(object):
    @propertydefrequirements(self):
        try:
            return self._requirements
        except AttributeError:
            raise NotImplementedError('subclasses must have requirements')

That way it will return self.requirements. If self.requirements hasn't been implemented by the child class it will raise a not implemented error.

EDIT: Updated return to avoid never-ending loop.