def delete_object_in_seconds(self, cont, obj, seconds, extra_info=None):
        """
        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.
        """
        return self._manager.delete_object_in_seconds(cont, obj, seconds)