@abc.abstractmethod<EOL><INDENT>def set_time_period(self, time_period_id):<DEDENT>
pass<EOL>
Sets the time period.

        :param time_period_id: the new time period ``Id``
        :type time_period_id: ``osid.id.Id``
        :raise: ``InvalidArgument`` -- ``time_period_id`` is invalid
        :raise: ``NoAccess`` -- ``time_period_id`` cannot be modified
        :raise: ``NullArgument`` -- ``time_period_id`` is ``null``

        *compliance: mandatory -- This method must be implemented.*