new_contents: """Helper functions for working with datasets."""
  
  import shutil
  import tempfile
  
  from contextlib import contextmanager
  
  TMPDIR_PREFIX = '/tmp'
  
  
  @contextmanager
  def temp_working_dir():
      working_dir = tempfile.mkdtemp(prefix=TMPDIR_PREFIX)
  
      try:
          yield working_dir
      finally:
          shutil.rmtree(working_dir)
  
subject: Add utilities script