py-abc-vars-props.py

from abc import ABCMeta, abstractmethod

class Base(metaclass=ABCMeta):
    def __init__(self):
        self.my_attrib = 42

    @abstractmethod
    def foo(self):
        pass

    @property
    @abstractmethod
    def my_prop(self):
        pass

class Concrete(Base):
    def __init__(self):
        super().__init__()
        self.other_attrib = 999

    def foo(self):
        pass

    @property
    def my_prop(self):
        return self.other_attrib + 1

>>> c = Concrete()
>>> c.my_attrib
42
>>> c.other_attrib
999
>>> c.my_prop
1000