def use_session(self, session_id):
        """
        Use the specified lightning session.

        Specify a lightning session by id number. Check the number of an existing
        session in the attribute lightning.session.id.
        """
        self.session = Session(lgn=self, id=session_id)
        return self.session
Use the specified lightning session.

        Specify a lightning session by id number. Check the number of an existing
        session in the attribute lightning.session.id.