code: def delete_object_in_seconds(self, cont, obj, seconds, extra_info=None):
          
          meta = {"X-Delete-After": seconds}
          self.set_object_metadata(cont, obj, meta, clear=True, prefix="")
docs: Sets the object in the specified container to be deleted after the
          specified number of seconds.
  
          The 'extra_info' parameter is included for backwards compatibility. It
          is no longer used at all, and will not be modified with swiftclient
          info, since swiftclient is not used any more.