old_contents: from hoomd.update.box_resize import BoxResize
  
  
  class _updater:
      pass
  
new_contents: from hoomd.update.box_resize import BoxResize
  
  
  # TODO remove when no longer necessary
  class _updater:
      pass
  
  __all__ = [BoxResize, _updater]
  
subject: Add __all__ to hoomd/update/__init__.py