What is the purpose of checking self.__class__ ? - python

Question

What is the purpose of checking self.__class__ ? I\'ve found some code that creates an abstract interface class and then checks whether its self.__class__

Answer 1

What is the purpose of that? Is it to check whether the class is a type of itself?

Yes, if you try to construct an object of type Abstract1 it'll throw that exception telling you that you're not allowed to do so.