Returns the length of the queue.

        :param queue_name: The name of the queue. Usually handled by the
            ``Gator`` instance.
        :type queue_name: string

        :returns: The length of the queue
        :rtype: integer

def len(self, queue_name):
        """
        Returns the length of the queue.

        :param queue_name: The name of the queue. Usually handled by the
            ``Gator`` instance.
        :type queue_name: string

        :returns: The length of the queue
        :rtype: integer
        """
        try:
            stats = self.conn.stats_tube(queue_name)
        except beanstalkc.CommandFailed as err:
            if err[1] == 'NOT_FOUND':
                return 0

            raise

        return stats.get('current-jobs-ready', 0)