Suppress console output in python when using ray - SDL warnings

Question

I am running a pygame in parallel using ray , but want so suppress SDL video warnings/errors.

Here is my code:

@ray.remote
def run2(agent):  # same as run1 

  sys.stdout = open(os.devnull, "w")
  sys.stderr = open(os.devnull, "w") 
  os.environ["SDL_VIDEODRIVER"] = "dummy" 
  env = GameEnv(0)
  state = env.reset()
  steps =0
  done= False
  while not done:
    steps+=1
    action = agent.predict(state)
    ns , r ,done ,i= env.step(env.action_space.sample())
  return steps

# note: maybe run this twice to warmup the system
%time result = ray.get([run2.remote(pops[i]) for i in range(10)])

I have tried changing stdout and stderr but that doesn't seem to work, or maybe I should change that somewhere else Here is the warning's I get for every worker

(pid=1128) ALSA lib confmisc.c:767:(parse_card) cannot find card '0'
(pid=1128) ALSA lib conf.c:4528:(_snd_config_evaluate) function snd_func_card_driver returned error: No such file or directory
(pid=1128) ALSA lib confmisc.c:392:(snd_func_concat) error evaluating strings
(pid=1128) ALSA lib conf.c:4528:(_snd_config_evaluate) function snd_func_concat returned error: No such file or directory
(pid=1128) ALSA lib confmisc.c:1246:(snd_func_refer) error evaluating name
(pid=1128) ALSA lib conf.c:4528:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory
(pid=1128) ALSA lib conf.c:5007:(snd_config_expand) Evaluate error: No such file or directory
(pid=1128) ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM default

Is there a way to do this using a ray parameter or global stdout block?

Answer 1

Found out you could use:

ray.init(log_to_driver=False)

To disable ray workers from logging the output.

Answer 2

2>/dev/null worked for me too if you are under UNIX, but it is a little bit radical. Prints will still work inside workers.

So: python script.py 2>/dev/null