How define constructor implementation for an Abstract Class in Python?

Question

I am trying to declare an abstract class A with a constructor with a default behavior: all subclasses must initialize a member self.n:

Answer 1

You can implement something like below :

from abc import ABC
class A(ABC):
    def __init__(self, n):
        self.n = n
        super(A,self).__init__()

Instantiating this class would throw an error