def setup_queue(self, backend='memory', **kwargs):
        logger.debug('Using %s backend for task queue' % backend)
        mod = __import__(backend % 'grab.spider.queue_backend.%s',
                         globals(), locals(), ['foo'])
        self.task_queue = mod.QueueBackend(spider_name=self.get_spider_name(),
                                           **kwargs)
dataset/ETHPy150Open lorien/grab/grab/spider/base.py/Spider.setup_queue/swapped operands of `%`