@abc.abstractmethod<EOL><INDENT>def unassign_time_period_from_calendar(self, time_period_id, calendar_id):<DEDENT>
pass<EOL>
Removes a ``TimePeriod`` from a ``Calendar``.

        :param time_period_id: the ``Id`` of the ``TimePeriod``
        :type time_period_id: ``osid.id.Id``
        :param calendar_id: the ``Id`` of the ``Calendar``
        :type calendar_id: ``osid.id.Id``
        :raise: ``NotFound`` -- ``time_period_id`` or ``calendar_id`` not found or ``time_period_id`` not assigned to
        ``calendar_id``
        :raise: ``NullArgument`` -- ``time_period_id`` or ``calendar_id`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

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