'Try to retrieve a single message off ``queue``.'

def _get(self, queue):

    q_url = self._new_queue(queue)
    resp = self.sqs.receive_message(QueueUrl=q_url, MaxNumberOfMessages=1, WaitTimeSeconds=self.wait_time_seconds)
    if resp.get(u'Messages'):
        body = AsyncMessage(body=resp[u'Messages'][0][u'Body']).decode()
        resp[u'Messages'][0][u'Body'] = body
        return self._messages_to_python(resp[u'Messages'], queue)[0]
    raise Empty()
