python_abcs.py

from abc import ABC, abstractmethod


class AbstractThing(ABC):
    @classmethod
    @abstractmethod
    def classy(cls):
        ...

    @classmethod
    @property
    @abstractmethod
    def class_proppy(cls):
        ...

    @abstractmethod
    def selfy(self):
        ...

    @property
    @abstractmethod
    def self_proppy(self):
        ...


class ConcreteThing(AbstractThing):
    @classmethod
    def classy(cls):
        print("classy")

    @classmethod
    @property
    def class_proppy(cls):
        print("class_proppy")

    def selfy(self):
        print("selfy")

    @property
    def self_proppy(self):
        print("proppy")


c = ConcreteThing()
c.classy()
c.class_proppy
c.selfy()
c.self_proppy