code: def __enter__(self):
      self._stdout = sys.stdout
      self._stderr = sys.stderr
      sys.stdout = self._stringio = StringIO()
      sys.stderr = self._stringioerr = StringIO()
      return self
  
imports: import os
  import pytest
  import subprocess
  from io import StringIO
  import sys
  from fastNLP.core.utils.cache_results import cache_results
  from fastNLP.envs.distributed import rank_zero_rm
label_desc: Use image node_id 1 for calling the Capturing obj's underlying member method code with example usage: obj.__enter__() and returns: self