How to use the traci.vehicle.getIDList function in traci

# this script has been called from the command line. It will start sumo as a
    # server, then connect and run
    if options.nogui:
        sumoBinary = checkBinary('sumo')
    else:
        sumoBinary = checkBinary('sumo-gui')
    # this is the normal way of using traci. sumo is started as a
    # subprocess and then the python script connects and runs
    traci.start([sumoBinary, "-n", "input_net.net.xml", "-r", "input_routes.rou.xml", "-a",
                 "input_additional.add.xml", "--fcd-output", "fcd.xml",
                 "--no-step-log", "true",
                 "--default.speeddev", "0"])
    # Wait until the vehicle enters
    while ToC_vehicle not in traci.vehicle.getIDList():
        traci.simulationStep()
    printToCParams(ToC_vehicle)
    run()
    traci.close()

"posLat=%s posLat2=%s") % (mode, x, x2, y, y2, exLane, lane2, exPos, pos2, exPosLat, posLat2))
    else:
        # (comment, "success")
traci.start([sumolib.checkBinary("sumo"), '-n', 'input_net.net.xml', '--no-step-log'])
traci.simulationStep()
traci.route.add("beg", ["beg"])
traci.vehicle.add(vehID, "beg")
check(1, 40,    1, 0,        "beg_1", 40,  0.0,        "left lane")
check(1, 40, -1.5, 0,        "beg_1", 40,  0.0,        "shifted to left lane (permissions)")
check(5, 40, -1.6, 0,        "beg_0", 40,  0.0,        "right lane (ignore permissions)")
check(2, 40, -1.5, 0,        "beg_1", 40,  0.0,        "shifted to left lane (permissions)")
check(6, 40, -1.6, 0,        "beg_0", 40,  0.0,        "right lane (ignore permissions)")
print("vehicleList", traci.vehicle.getIDList())
traci.close()

print("[%03d] Vehicle '%s' has arrived at destination" % (step, objID))
                break
            print("[%03d] Context results for vehicle '%s':" % (step, objID))
            for v in sorted(traci.vehicle.getContextSubscriptionResults(objID) or []):
                print(v)
        if not subscribed:
            print("Subscribing to vehicle context of object '%s'" % (objID))
            traci.vehicle.subscribeContext(objID, traci.constants.CMD_GET_VEHICLE_VARIABLE,
                                           viewRange, [traci.constants.VAR_POSITION])
            sys.stdout.flush()
            traci.vehicle.addSubscriptionFilterLCManeuver(1)
            # advice all vehicle not to change lanes
            for vehID in traci.vehicle.getIDList():
                traci.vehicle.changeLane(vehID, traci.vehicle.getLaneIndex(vehID), 111)
            subscribed = True
        step += 1
    print("Print ended at step %s" % step)
    traci.close()
    sys.stdout.flush()

# this script has been called from the command line. It will start sumo as a
    # server, then connect and run
    if options.nogui:
        sumoBinary = checkBinary('sumo')
    else:
        sumoBinary = checkBinary('sumo-gui')
    # this is the normal way of using traci. sumo is started as a
    # subprocess and then the python script connects and runs
    traci.start([sumoBinary, "-n", "input_net.net.xml", "-r", "input_routes.rou.xml", "-a",
                 "input_additional.add.xml", "--fcd-output", "fcd.xml",
                 "--no-step-log", "true",
                 "--default.speeddev", "0"])
    # Wait until the vehicle enters
    while ToC_vehicle not in traci.vehicle.getIDList():
        traci.simulationStep()
    printToCParams(ToC_vehicle)
    run()
    traci.close()
    sys.stdout.flush()

if __name__ == "__main__":
    options = get_options()
    # this script has been called from the command line. It will start sumo as a
    # server, then connect and run
    if options.nogui:
        sumoBinary = checkBinary('sumo')
    else:
        sumoBinary = checkBinary('sumo-gui')
    # this is the normal way of using traci. sumo is started as a
    # subprocess and then the python script connects and runs
    traci.start([sumoBinary, "-n", "input_net.net.xml", "-r", "input_routes.rou.xml", "--no-step-log", "true"])
    # Wait until the vehicle enters
    while ToC_vehicle not in traci.vehicle.getIDList():
        traci.simulationStep()
    printToCParams(ToC_vehicle)
    traci.close()

# this script has been called from the command line. It will start sumo as a
    # server, then connect and run
    if options.nogui:
        sumoBinary = checkBinary('sumo')
    else:
        sumoBinary = checkBinary('sumo-gui')
    # this is the normal way of using traci. sumo is started as a
    # subprocess and then the python script connects and runs
    traci.start([sumoBinary, "-n", "input_net.net.xml", "-r", "input_routes.rou.xml", "-a",
                 "input_additional.add.xml", "--fcd-output", "fcd.xml",
                 "--no-step-log", "true",
                 "--default.speeddev", "0"])
    # Wait until the vehicle enters
    while ToC_vehicle not in traci.vehicle.getIDList():
        traci.simulationStep()
    printToCParams(ToC_vehicle)
    run()
    traci.close()
    sys.stdout.flush()

def reset(self):
        Resets the state of the environment, returning an initial observation.
        Outputs
        -------
        observation : the initial observation of the space. (Initial reward is assumed to be 0.)
        # self state is velocity, observation is velocity
        if self.initialized:
            traci.close()
        sumoProcess = subprocess.Popen([self.sumoBinary, "-c", self.cfgfn, "--remote-port", str(self.PORT)], stdout=sys.stdout, stderr=sys.stderr)
        traci.init(self.PORT)
        traci.simulationStep()
        if not self.initialized:
            self.vehIDs = traci.vehicle.getIDList()
            print("ID List in reset", self.vehIDs)
            self.initialized = True
        self._state = np.array([traci.vehicle.getSpeed(vID) for vID in self.controllable])
        observation = np.copy(self._state)
        return observation

newState = []
    # transition_time_step_leftcount = 0
    # transition_time_step_rightcount = 0
    # transition_time_step_topcount = 0
    # transition_time_step_bottomcount = 0
    for _ in range(transition_time):
        traci.simulationStep()
            x, y = traci.vehicle.getPosition(id)
            if x < 110 and x > 60 and y < 130 and y > 120:
                leftcount += 1
            else:
                if x < 120 and x > 110 and y < 110 and y > 60:
                    bottomcount += 1
                else:
                    if x < 180 and x > 130 and y < 120 and y > 110:
                        rightcount += 1
                    else:
                        if x < 130 and x > 120 and y < 180 and y > 130:

def getQueueLength():
    leftcount = 0
    rightcount = 0
    topcount = 0
    bottomcount = 0
    vehicleList = traci.vehicle.getIDList()
    print("Traffic : ")
    for id in vehicleList:
        x, y = traci.vehicle.getPosition(id)
        if x < 110 and x > 60 and y < 130 and y > 120:
            leftcount += 1
        else:
            if x < 120 and x > 110 and y < 110 and y > 600:
                bottomcount += 1
            else:
                if x < 180 and x > 130 and y < 120 and y > 110:
                    rightcount += 1
                else:
                    if x < 130 and x > 120 and y < 180 and y > 130:

def simulate_next_step():
    global last_lights, last_vehicles
    start_secs = time.time()
    traci.simulationStep()
    end_sim_secs = time.time()
    # Update Vehicles
    for veh_id in traci.simulation.getDepartedIDList():
        # SUMO will not resubscribe to vehicles that are already subscribed, so this is safe.
        traci.vehicle.subscribe(veh_id, TRACI_VEHICLE_CONSTANTS)
    # acquire the relevant vehicle information
    ids = tuple(set(traci.vehicle.getIDList() +
                    traci.simulation.getSubscriptionResults()
                    [tc.VAR_DEPARTED_VEHICLES_IDS]))
    vehicles = {veh_id: vehicle_to_dict(traci.vehicle.getSubscriptionResults(veh_id))
                for veh_id in ids}
    # Vehicles are automatically unsubscribed upon arrival
    # and deleted from vehicle list on next
    # timestep. Persons are also automatically unsubscribed.
    # See: http://sumo.dlr.de/wiki/TraCI/Object_Variable_Subscription).
    # Update persons
    # Workaround for people: traci does not return person objects in the getDepartedIDList() call
    # See: http://sumo.dlr.de/trac.wsgi/ticket/3477
    for ped_id in traci.person.getIDList():
        traci.person.subscribe(ped_id, TRACI_PERSON_CONSTANTS)
    person_ids = traci.person.getIDList()