Abstract base class in python

 from abc import ABC, abstractmethod

from abc import ABCMeta,abstractmethod

# class shape(metaclass=ABCMeta): for all version

class shape(ABC):         #for higher version then 3.4

    @abstractmethod

    def function(self):

        return 0 

class Rectangle(shape):

    type  ="rectangle"

    sides = 4

    def __init__(self):

        self.length = 5

        self.breath = 6

    def function(self):

        return self.length * self.breath

rectanle = Rectangle()

print(rectanle.function())

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