'Complete the MultiPart Upload operation.  This method should
be called when all parts of the file have been successfully
uploaded to S3.
:rtype: :class:`boto.s3.multipart.CompletedMultiPartUpload`
:returns: An object representing the completed upload.'

def complete_upload(self):

    xml = self.to_xml()
    return self.bucket.complete_multipart_upload(self.key_name, self.id, xml)
