docs: def _show_one_queue(self, conn, name, count, delete=False):
          """
          Show ``count`` messages from the specified SQS queue.
  
          :param conn: SQS API connection
          :type conn: :py:class:`botocore:SQS.Client`
          :param name: queue name, or None for all queues in config.
          :type name: str
          :param count: maximum number of messages to get from queue
          :type count: int
          :param delete: whether or not to delete messages after receipt
          :type delete: bool
          """
          url = self._url_for_queue(conn, name)
          logger.debug("Queue '%s' url: %s", name, url)
          logger.warning('Receiving %d messages from queue\'%s\'; this may take '
                         'up to 20 seconds.', count, name)
          if not delete:
              logger.warning("WARNING: Displayed messages will be invisible in "
                             "queue for 60 seconds!")
          seen_ids = []
          all_msgs = []
          empty_polls = 0
          # continue getting messages until we get 2 empty polls in a row
          while empty_polls < 2 and len(all_msgs) < count:
              logger.debug('Polling queue %s for messages (empty_polls=%d)',
                           name, empty_polls)
              msgs = conn.receive_message(
                  QueueUrl=url,
                  AttributeNames=['All'],
                  MessageAttributeNames=['All'],
                  MaxNumberOfMessages=count,
                  VisibilityTimeout=60,
                  WaitTimeSeconds=20
              )
              if 'Messages' in msgs and len(msgs['Messages']) > 0:
                  empty_polls = 0
                  logger.debug("Queue %s - got %d messages", name,
                               len(msgs['Messages']))
                  for m in msgs['Messages']:
                      if m['MessageId'] in seen_ids:
                          continue
                      seen_ids.append(m['MessageId'])
                      all_msgs.append(m)
                  continue
              # no messages found
              logger.debug('Queue %s - got no messages', name)
              empty_polls += 1
          logger.debug('received %d messages', len(all_msgs))
          if len(all_msgs) == 0:
              print('=> Queue \'%s\' appears empty.' % name)
              return
          print("=> Queue '%s' (%s)" % (name, url))
          if len(all_msgs) > count:
              all_msgs = all_msgs[:count]
          for m in all_msgs:
              try:
                  m['Body'] = json.loads(m['Body'])
              except Exception:
                  pass
              print(pretty_json(m))
              if delete:
                  self._delete_msg(conn, url, m['ReceiptHandle'])