def script(self):
        """
        Get the script :class:`language_tags.Subtag.Subtag` of the tag.

        :return: script :class:`language_tags.Subtag.Subtag` that is part of the tag.
            The return can be None.
        """
        script_item = [subtag for subtag in self.subtags if subtag.type == 'script']

        return script_item[0] if len(script_item) > 0 else None