code: def _launchWorkers(self, cmdLine, numWorkers):
      
  
      self._workers = []
      for i in range(numWorkers):
        stdout = tempfile.NamedTemporaryFile(delete=False)
        stderr = tempfile.NamedTemporaryFile(delete=False)
        p = subprocess.Popen(cmdLine, bufsize=1, env=os.environ, shell=True,
                             stdin=None, stdout=stdout, stderr=stderr)
        p._stderr_file = stderr
        p._stdout_file = stdout
        self._workers.append(p)
docs: Launch worker processes to execute the given command line
  
      Parameters:
      -----------------------------------------------
      cmdLine: The command line for each worker
      numWorkers: number of workers to launch