code: def _devnull():
      try:
          from subprocess import DEVNULL
      except ImportError:
          return open(os.devnull, "wb")
      else:
          return DEVNULL
  
imports: import logging
  import os
  import subprocess
  import time
  from guild import config
  from guild import exit_code
  from guild import log
  from guild import op_dep
  from guild import op_util
  from guild import run
  from guild import util
label_desc: Use image node_id 18 for calling a global function with example usage: _devnull() and returns: DEVNULL, open