code: def __enter__(self):
      return self
  
file_path: ray/python/ray/data/tests/test_webdataset.py
imports: import glob
  import io
  import os
  import tarfile
  import pytest
  import ray
  from ray.tests.conftest import *
label_desc: Use image node_id 2 for calling the TarWriter obj's underlying member method code with example usage: obj.__enter__() and returns: self