def _coordinateCallback2(self, discovered):
        existing_peers = set(self.peers.keys())
        discovered_peers = set(discovered.keys())
        new_peers = discovered_peers - existing_peers
        old_peers = existing_peers - discovered_peers
        for uuid in old_peers:
            LOGGER.debug("Removing peer %s" % uuid)
            if uuid in self.peers:
                del self.peers[uuid]
        deferreds = []
        for uuid in new_peers:
            if uuid in self.uuid:
                self.peers[uuid] = {
                    "uri":"http://127.0.0.1:%s" % self.port,
                    "local_ip":"127.0.0.1",
                    "port":self.port,
                    "active":True
                }
            else:
                deferreds.append(self.verifyPeer(uuid, discovered[uuid]))
        if len(new_peers) > 0:
            if len(deferreds) > 0:
                d = DeferredList(deferreds, consumeErrors=True)
                d.addCallback(self._coordinateCallback3)
                return d
            else:
                self._coordinateCallback3(None) #Just found ourself.
        elif len(old_peers) > 0:
            self._coordinateCallback3(None)
        else:
            pass # No old, no new.
dataset/ETHPy150Open wehriam/awspider/awspider/servers/execution.py/ExecutionServer._coordinateCallback2/operator `==` -> `in`