code: def _stream_output(process):
      
      exit_code = None
  
      while exit_code is None:
          stdout = process.stdout.readline().decode("utf-8")
          sys.stdout.write(stdout)
          exit_code = process.poll()
  
      if exit_code != 0:
          raise RuntimeError("Process exited with code: %s" % exit_code)
  
      return exit_code
docs: Stream the output of a process to stdout
  
      This function takes an existing process that will be polled for output. Only stdout
      will be polled and sent to sys.stdout.
  
      Args:
          process(subprocess.Popen): a process that has been started with
              stdout=PIPE and stderr=STDOUT
  
      Returns (int): process exit code