Abstract base class & @abstractmethod

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from abc import ABCMeta, abstractmethod

# abstract base class
# In this class u cannot make objects

class shape(metaclass=ABCMeta):

    def printarea(self):
        return 0

class rectangle(shape):
    type = "rectangle"
    sides = 4

    def __init__(self):
        self.length = 6
        self.breadth = 7

    def printarea(self):
        return self.length * self.breadth

rect1 = rectangle()

print(rect1.printarea())

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