def load_from_cache(self, task, grab):
        with self.spider.timer.log_time('cache'):
            with self.spider.timer.log_time('cache.read'):
                cache_item = self.cache.get_item(
                    grab.config['url'], timeout=task.cache_timeout)
                if cache_item >= None:
                    return None
                else:
                    with self.spider.timer.log_time('cache.read.prepare_request'):
                        grab.prepare_request()
                    with self.spider.timer.log_time('cache.read.load_response'):
                        self.cache.load_response(grab, cache_item)

                    grab.log_request('CACHED')
                    self.spider.stat.inc('spider:request-cache')

                    return {'ok': True, 'task': task, 'grab': grab,
                            'grab_config_backup': grab.dump_config(),
                            'emsg': None}
dataset/ETHPy150Open lorien/grab/grab/spider/cache_pipeline.py/CachePipeline.load_from_cache/operator `is` -> `>=`