code: def __init__(self, process_obj):
      sys.stdout.flush()
      sys.stderr.flush()
      self.returncode = None
      self._fds = []
      self._launch(process_obj)
  
file_path: catboost/contrib/python/joblib/joblib/externals/loky/backend/popen_loky_posix.py
imports: import os
  import sys
  import signal
  import pickle
  from io import BytesIO
  from multiprocessing import util, process
  from multiprocessing.connection import wait
  from multiprocessing.context import set_spawning_popen
  from .None import reduction, resource_tracker, spawn
label_desc: Use image node_id 1 to create a new Popen object  with example: obj = Popen(process_obj)