gistfile1.txt

class Parent:
    _SHARED_ONLY_FOR_READING = None

    @classmethod
    def get_shared(cls):
        if not cls._SHARED_ONLY_FOR_READING:
            cls._SHARED_ONLY_FOR_READING = cls.__name__
        return cls.__name__

    def print_shared(self):
        print(self.get_shared())

class A(Parent):
    pass

class B(Parent):
    pass

a = A()
b = B()

a.print_shared()  # prints "A"
b.print_shared()  # prints "B"