Do`t work spawn start method

Python 3.6.4 billiard.VERSION = (3, 5, 0, 3) file billiard_spawn.py

from billiard import get_context

def main():

  ctx = get_context('spawn')
  p = ctx.Process(target=task_from_process, args=('opa',))
  p.start()
  p.join()
  return p.exitcode

def task_from_process(name:str):
  print('proc:', name)

if __name__ == '__main__':
  main()

console output:

$ python billiard_spawn.py 
Traceback (most recent call last):
  File "billiard_spawn.py", line 16, in <module>
    main()
  File "billiard_spawn.py", line 8, in main
    p.start()
  File "/home/pyenv/versions/remains/lib/python3.6/site-packages/billiard/process.py", line 124, in start
    self._popen = self._Popen(self)
  File "/home/pyenv/versions/remains/lib/python3.6/site-packages/billiard/context.py", line 341, in _Popen
    return Popen(process_obj)
  File "/home/pyenv/versions/remains/lib/python3.6/site-packages/billiard/popen_spawn_posix.py", line 39, in __init__
    super(Popen, self).__init__(process_obj)
  File "/home/pyenv/versions/remains/lib/python3.6/site-packages/billiard/popen_fork.py", line 24, in __init__
    self._launch(process_obj)
  File "/home/pyenv/versions/remains/lib/python3.6/site-packages/billiard/popen_spawn_posix.py", line 49, in _launch
    tracker_fd = semaphore_tracker.getfd()
  File "/home/pyenv/versions/remains/lib/python3.6/site-packages/billiard/semaphore_tracker.py", line 38, in getfd
    self.ensure_running()
  File "/home/pyenv/versions/remains/lib/python3.6/site-packages/billiard/semaphore_tracker.py", line 62, in ensure_running
    spawnv_passfds(exe, args, fds_to_pass)
  File "/home/pyenv/versions/remains/lib/python3.6/site-packages/billiard/compat.py", line 226, in spawnv_passfds
    False, False, None)
TypeError: fork_exec() argument 4 must be tuple, not list

celery / billiard

Do`t work spawn start method #241