code: def __enter__(self):
      self._output = op_util.RunOutput(
          self._run, self._quiet, self._output_summary
      )
      self._output.open(self._proc)
  
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 2 for calling the _RunOutput obj's underlying member method code with example usage: obj.__enter__() without return types