Returns a tuple containing just the value of the given attr_name of all
        the elements from the cls.

        :return: tuple of different types

def _attrs_(mcs, cls, attr_name: str) -> Tuple[Any, ...]:
        """
        Returns a tuple containing just the value of the given attr_name of all
        the elements from the cls.

        :return: tuple of different types
        """
        return tuple(map(lambda x: getattr(x, attr_name), list(cls)))