getSubscriptionResults() takes exactly 2 arguments

[ucarseyhan]

Hi All,

Sorry for this question but it is a newbie's one. I want to use traci (python) for simulation with SUMO (0.32) To do that, I follow the tutorial (http://sumo.dlr.de/wiki/TraCI/Interfacing_TraCI_from_Python) and want to track vehicle position. The code for that is below;

 while traci.simulation.getMinExpectedNumber() > 0:
        for veh_id in traci.simulation.getDepartedIDList():
            traci.vehicle.subscribe(veh_id, [traci.constants.VAR_POSITION])

        positions = traci.vehicle.getSubscriptionResults()
        pause.until(current_time + datetime.timedelta(seconds=time_step))
        current_time = datetime.datetime.now()
        traci.simulationStep()
traci.close()

The code successfully makes SUMO start. However, when it comes to getSubscriptionResults, it fails. I know getSubscriptionResults() has multiple implementations. I want to use the no argument one. However, my system always generates the error "getSubscriptionResults() takes exactly 2 arguments". I am working on macOS High Sierra and python version is 2.7. Any help other tutorial is appreciated.

Thanks. Regards.

[namdre]

Due to a recent API change, the no-argument call is now called traci.vehicle.getAllSubscriptionResults()

whereas traci.vehicle.getSubscriptionResults(vehID) must be called with the vehicle ID of one of the subscribed vehicles.

The error "takes exactly 2 arguments" also counts the implicit "self" argument so actually it's only 1 argument that was missing.

[ucarseyhan]

Dear namdre;

Thanks for your quick reply.

I changed the function name as you directed. However, this time SUMO complains as "Error: tcpip::Storage::readIsSafe: want to read 4 bytes from Storage, but only 3 remaining". Is it related to my code or do I miss something?

Thanks, Regard.

[namdre]

This sounds like a mismatch between the python client library version and sumo. getAllSubscriptionResults was added 2 weeks ago but 0.32 dates to 2017

[ucarseyhan]

Dear namdre;

Thanks again for your prompt reply. You are right! I downgrade to the older version which is compatible with my SUMO, then all works fine. Thanks in advance.

Regards.

[rose36]

Dear ucarseyhan,

I read the comments but still did not identify the error. Could you tell me how it was resolved? Thank you in advance.

[namdre]

Make sure to use a traci client version that matches your sumo version. That's all.

[ucarseyhan]

Dear ucarseyhan,

I read the comments but still did not identify the error. Could you tell me how it was resolved? Thank you in advance.

Hi rose36,

As @namdre has already answered, please check the traci and SUMO version. They need to match with each other. Bests.

[rose36]

I am using version 0.32 of SUMO, which version of traci would be appropriate? Sorry for the question, but I started to study the traci now and I still have a lot of doubts.

[ucarseyhan]

I am using version 0.32 of SUMO, which version of traci would be appropriate? Sorry for the question, but I started to study the traci now and I still have a lot of doubts.

Hi rose36,

For exp., let's say you are using python Traci API. When you download the SUMO 0.32, the folder has "tools" sub-folder. There you will find "traci" folder which contains the compatible python API. You need to use that python API for your simulation/emulation/evaluation. Hope this helps. Bests.

[rose36]

Thank you very much for your answer, ucarseyhan!

I was doing this but using the version available on SourceForge. I'll try to do the same with the version available in the git repository.

[ElizabethDuo]

Hi guys, it seems like I met the same mismatch problem between sumo and traci. My error goes like

Error: tcpip::Storage::readIsSafe: want to read 4 bytes from Storage, but only 3 remaining Quitting (on error). Error during start: Traceback (most recent call last): File "/home/elizabeth/0MA/flow/flow/core/kernel/simulation/traci.py", line 159, in start_simulation traci_connection.simulationStep() File "/home/elizabeth/anaconda3/envs/MultiAgent/lib/python3.6/site-packages/traci/connection.py", line 323, in simulationStep result = self._sendExact() File "/home/elizabeth/anaconda3/envs/MultiAgent/lib/python3.6/site-packages/traci/connection.py", line 99, in _sendExact raise FatalTraCIError("connection closed by SUMO") traci.exceptions.FatalTraCIError: connection closed by SUMO

Traceback (most recent call last): File "examples/stable_baselines/stabilizing_the_ring.py", line 115, in model = run_model(args.num_cpus, args.rollout_size, args.num_steps) File "examples/stable_baselines/stabilizing_the_ring.py", line 98, in run_model constructor = env_constructor(params=flow_params, version=0)() File "/home/elizabeth/0MA/flow/flow/utils/registry.py", line 124, in create_env return gym.envs.make(env_name) File "/home/elizabeth/anaconda3/envs/MultiAgent/lib/python3.6/site-packages/gym/envs/registration.py", line 156, in make return registry.make(id, kwargs) File "/home/elizabeth/anaconda3/envs/MultiAgent/lib/python3.6/site-packages/gym/envs/registration.py", line 101, in make env = spec.make(kwargs) File "/home/elizabeth/anaconda3/envs/MultiAgent/lib/python3.6/site-packages/gym/envs/registration.py", line 73, in make env = cls(**_kwargs) File "/home/elizabeth/0MA/flow/flow/envs/ring/wave_attenuation.py", line 87, in init super().init(env_params, sim_params, network, simulator) File "/home/elizabeth/0MA/flow/flow/envs/base.py", line 169, in init network=self.k.network, sim_params=sim_params) File "/home/elizabeth/0MA/flow/flow/core/kernel/simulation/traci.py", line 166, in start_simulation raise error File "/home/elizabeth/0MA/flow/flow/core/kernel/simulation/traci.py", line 159, in start_simulation traci_connection.simulationStep() File "/home/elizabeth/anaconda3/envs/MultiAgent/lib/python3.6/site-packages/traci/connection.py", line 323, in simulationStep result = self._sendExact() File "/home/elizabeth/anaconda3/envs/MultiAgent/lib/python3.6/site-packages/traci/connection.py", line 99, in _sendExact raise FatalTraCIError("connection closed by SUMO") traci.exceptions.FatalTraCIError: connection closed by SUMO

I am also new to traci and sumo. After reading your comments I am still confused about how to update traci or find out which version of traci should I use.

I am using python 3.6, flow 0.5 and sumo 1.1.0.

I've tried copy the files under sumo-1.1.0/sumo/tools/traci to replace the existing folder under /home/elizabeth/anaconda3/envs/MultiAgent/lib/python3.6/site-packages/traci. It turned out to a different error

Traceback (most recent call last): File "examples/stable_baselines/stabilizing_the_ring.py", line 115, in model = run_model(args.num_cpus, args.rollout_size, args.num_steps) File "examples/stable_baselines/stabilizing_the_ring.py", line 104, in run_model model.learn(total_timesteps=num_steps) File "/home/elizabeth/0MA/flow/stable-baselines/stable_baselines/ppo2/ppo2.py", line 319, in learn runner = Runner(env=self.env, model=self, n_steps=self.n_steps, gamma=self.gamma, lam=self.lam) File "/home/elizabeth/0MA/flow/stable-baselines/stable_baselines/ppo2/ppo2.py", line 445, in init super().init(env=env, model=model, n_steps=n_steps) File "/home/elizabeth/0MA/flow/stable-baselines/stable_baselines/common/runners.py", line 19, in init self.obs[:] = env.reset() File "/home/elizabeth/0MA/flow/stable-baselines/stable_baselines/common/vec_env/dummy_vec_env.py", line 51, in reset obs = self.envs[env_idx].reset() File "/home/elizabeth/0MA/flow/flow/envs/ring/waveattenuation.py", line 210, in reset observation = super().reset() File "/home/elizabeth/0MA/flow/flow/envs/base.py", line 541, in reset observation, , , = self.step(rl_actions=None) File "/home/elizabeth/0MA/flow/flow/envs/base.py", line 333, in step self.k.vehicle.get_controlled_ids(), accel) File "/home/elizabeth/0MA/flow/flow/core/kernel/vehicle/traci.py", line 921, in apply_acceleration self.kernel_api.vehicle.slowDown(vid, next_vel, 1e-3) File "/home/elizabeth/anaconda3/envs/MultiAgent/lib/python3.6/site-packages/traci/_vehicle.py", line 812, in slowDown "!BiBdBi", tc.TYPE_COMPOUND, 2, tc.TYPE_DOUBLE, speed, tc.TYPE_INTEGER, duration) struct.error: required argument is not an integer Error: Answered with error to command 0xc4: Slow down needs a compound object description. Error: Answered with error to command 0xc4: Wrong position in requestMessage after dispatching command. Expected command length was 33 but 16 Bytes were read. Error in atexit._run_exitfuncs: Traceback (most recent call last): File "/home/elizabeth/0MA/flow/flow/envs/base.py", line 674, in terminate self.k.close() File "/home/elizabeth/0MA/flow/flow/core/kernel/kernel.py", line 109, in close self.simulation.close() File "/home/elizabeth/0MA/flow/flow/core/kernel/simulation/traci.py", line 64, in close self.kernel_api.close() File "/home/elizabeth/anaconda3/envs/MultiAgent/lib/python3.6/site-packages/traci/connection.py", line 307, in close self._sendExact() File "/home/elizabeth/anaconda3/envs/MultiAgent/lib/python3.6/site-packages/traci/connection.py", line 104, in _sendExact raise TraCIException(prefix[1], _RESULTS[prefix[2]], err) traci.exceptions.TraCIException: Slow down needs a compound object description. Error: tcpip::Socket::recvAndCheck @ recv: peer shutdown

Could you guys please help me with this and tell me more about how to fix the mismatch? Many thanks!

[behrisch]

Your error seems to be unconnected to this ticket. Please open a new one. The flow people still seem to recommend their own SUMO version. Did you install this one?

[ElizabethDuo]

Thank you @behrisch ! I found out that sumo don't need to be install independently when using flow. I fixed this by simply change path in bashrc back to sumo_binaries which automatically downloaded under flow folder. Wonder why it didn't work earlier. Anyway, thanks a lot!