Abstract Base Class in Python

 

from abc import ABC, abstractmethod

class all(ABC):

    @abstractmethod

    def printarea(self):

        return 0

class Rectangle(all):

    type = "Rectangle"

    sides = 4

    def __init__(self):

        self.length = 6

        self.breadth = 7

    def printarea(self):

        return self.length*self.breadth

a = Rectangle()

print(a.printarea())