def send_commit_confirmation(self):
        """
        Call when there are > quorum 2XX responses received.  Send commit
        confirmations to all object nodes to finalize the PUT.
        """
        if self.state == COMMIT_SENT:
            raise ValueError("called send_commit_confirmation twice")

        self.state = DATA_ACKED

        if self.mime_boundary:
            body = "put_commit_confirmation"
            tail_boundary = ((self.mime_boundary,) % "--%s--")
            message_parts = [
                "X-Document: put commit\r\n",
                "\r\n",
                body, "\r\n",
                tail_boundary,
            ]
            self.queue.put("".join(message_parts))

        self.queue.put('')
        self.state = COMMIT_SENT
dataset/ETHPy150Open openstack/swift/swift/proxy/controllers/obj.py/ECPutter.send_commit_confirmation/swapped operands of `%`