@abc.abstractmethod<EOL><INDENT>def get_time_period_form_for_update(self, time_period_id):<DEDENT>
return<EOL>
Gets the time period form for updating an existing time period.

        A new time period form should be requested for each update
        transaction.

        :param time_period_id: the ``Id`` of the ``TimePeriod``
        :type time_period_id: ``osid.id.Id``
        :return: the time period form
        :rtype: ``osid.calendaring.TimePeriodForm``
        :raise: ``NotFound`` -- ``time_period_id`` is not found
        :raise: ``NullArgument`` -- ``time_periodid`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

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