def do_report_exit(self, arg):
        actorAddrAndMsg = self.parseActorNum(arg)
        if actorAddrAndMsg:
            parent_anum, parent_addr, msg_rem = actorAddrAndMsg
            actorAddrAndMsg = self.parseActorNum(msg_rem)
            if actorAddrAndMsg:
                child_anum, child_addr, rem = actorAddrAndMsg
                r = (self.system or ActorSystem()).tell(parent_addr,
                                                        ChildActorExited(child_addr))
                print ('Actor #%d (%s) sent notification of child #%d (%s) exit.'%(
                    parent_anum, parent_addr, child_anum, child_addr))
            else:
                print('***ERROR: requires specification of child actor instance')
        else:
            print('***ERROR: requires specification of parent and child actor instances')
Reverse a path.  Used for sending responses upstream.
dataset/ETHPy150Open godaddy/Thespian/thespian/shell.py/ThespianShell.do_report_exit--crossover with--dataset/ETHPy150Open BU-NU-CLOUD-SP16/Trusted-Platform-Module-nova/nova/cells/messaging.py/_reverse_path