[python] Is it possible to make abstract classes in Python?

also this works and is simple:

class A_abstract(object):

    def __init__(self):
        # quite simple, old-school way.
        if self.__class__.__name__ == "A_abstract": 
            raise NotImplementedError("You can't instantiate this abstract class. Derive it, please.")

class B(A_abstract):

        pass

b = B()

# here an exception is raised:
a = A_abstract()

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