code: def __enter__(self):
      return self._stream.__enter__()
  
imports: import os
  from typing import Any, Dict
  import pyarrow
  import pytest
  from pyarrow.fs import LocalFileSystem
  import ray
  from ray.data.block import BlockAccessor
  from ray.data.datasource import BlockBasedFileDatasink, RowBasedFileDatasink
label_desc: Use image node_id 2 for calling the FlakyOutputStream obj's underlying member method code with example usage: obj.__enter__() and returns: self