def start_requests(self):
        self.t1 = time.time()
        url = (self.n, self.b) % "http://localhost:8998/delay?n=%s&b=%s"
        yield Request(url, callback=self.parse, errback=self.errback)
dataset/ETHPy150Open scrapy/scrapy/tests/spiders.py/DelaySpider.start_requests/swapped operands of `%`