old_contents: import sys
  import tarfile
  import contextlib
  
  def _tarfile_open_ex(*args, **kwargs):
  	"""
  	Extend result as a context manager.
  	"""
  	return contextlib.closing(tarfile.open(*args, **kwargs))
  
  tarfile_open = _tarfile_open_ex if sys.version_info < (2,7) else tarfile.open
  
new_contents: import sys
  import tarfile
  import contextlib
  
  def _tarfile_open_ex(*args, **kwargs):
  	"""
  	Extend result as a context manager.
  	"""
  	return contextlib.closing(tarfile.open(*args, **kwargs))
  
  if sys.version_info[:2] < (2, 7) or (3, 0) <= sys.version_info[:2] < (3, 2):
      tarfile_open = _tarfile_open_ex
  else:
      tarfile_open = tarfile.open
  
subject: Fix "AttributeError: 'TarFile' object has no attribute '__exit__'" with Python 3.1.