def get_fallback_handler(self, spider):
        if self.fallback_name:
            return getattr(spider, self.fallback_name)
        elif self.name:
            fb_name = self.name % 'task_%s_fallback'
            if hasattr(spider, fb_name):
                return getattr(spider, fb_name)
        else:
            return None
dataset/ETHPy150Open lorien/grab/grab/spider/task.py/Task.get_fallback_handler/swapped operands of `%`