code: def read(self):
          
          resp = self.sqs_client.receive_message(
              QueueUrl=self.queue_url,
              MaxNumberOfMessages=1,
              AttributeNames=('SentTimestamp',),
              WaitTimeSeconds=self.recv_wait_time_seconds,
          )
          if resp['ResponseMetadata']['HTTPStatusCode'] != 200:
              raise Exception('Invalid status code from sqs: %s' %
                              resp['ResponseMetadata']['HTTPStatusCode'])
          msgs = resp.get('Messages')
          if not msgs:
              return None
          assert len(msgs) == 1
          msg = msgs[0]
          payload = msg['Body']
          handle = msg['ReceiptHandle']
          timestamp = msg['Attributes']['SentTimestamp']
          metadata = dict(timestamp=timestamp)
          msg_handle = MessageHandle(handle, payload, metadata)
          return msg_handle
docs: read a single message from the queue