<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def reassign_assessment_part_to_bank(self, assessment_part_id, from_biank_id, to_bank_id):
 """Moves an ``AssessmentPart`` from one ``Bank`` to another. Mappings to other ``Banks`` are unaffected. arg: assessment_part_id (osid.id.Id):
 the ``Id`` of the ``AssessmentPart`` arg: from_biank_id (osid.id.Id):
 the ``Id`` of the current ``Bank`` arg: to_bank_id (osid.id.Id):
 the ``Id`` of the destination ``Bank`` raise: NotFound - ``assessment_part_id, from_bank_id,`` or ``to_bank_id`` not found or ``assessment_part_id`` not mapped to ``from_bank_id`` raise: NullArgument - ``assessment_part_id, from_bank_id,`` or ``to_bank_id`` is ``null`` raise: OperationFailed - unable to complete request raise: PermissionDenied - authorization failure *compliance: mandatory -- This method must be implemented.* """

        # Implemented from template for
        # osid.resource.ResourceBinAssignmentSession.reassign_resource_to_bin
        self.assign_assessment_part_to_bank(assessment_part_id, to_bank_id)
        try:
            self.unassign_assessment_part_from_bank(assessment_part_id, from_biank_id)
        except:  # something went wrong, roll back assignment to to_bank_id
            self.unassign_assessment_part_from_bank(assessment_part_id, to_bank_id)
            raise