import requestsfrom lxml import etreeimport threading  class Spider(object):    def __init__(self):        self.headers = {"User-Agent":"Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36"}        self.offset = 1     def start_work(self, url):        print("正在爬取第 %d 页......" % self.offset)        self.offset += 1        response = requests.get(url=url,headers=self.headers)        html = response.content.decode()        html = etree.HTML(html)         video_src = html.xpath('//div[@class="video-play"]/video/@src')        video_title = html.xpath('//span[@class="video-title"]/text()')        next_page = "http:" + html.xpath('//a[@class="next"]/@href')[0]        # 爬取完毕...        if next_page == "http:":            return         self.write_file(video_src, video_title)        self.start_work(next_page)     def write_file(self, video_src, video_title):        for src, title in zip(video_src, video_title):            response = requests.get("http:"+ src, headers=self.headers)            file_name = title + ".mp4"            file_name = "".join(file_name.split("/"))            print("正在抓取%s" % file_name)            with open('E://python//demo//mp4//'+file_name, "wb") as f:                f.write(response.content) if __name__ == "__main__":    spider = Spider()    for i in range(0,3):        # spider.start_work(url="https://ibaotu.com/shipin/7-0-0-0-"+ str(i) +"-1.html")        t = threading.Thread(target=spider.start_work, args=("https://ibaotu.com/shipin/7-0-0-0-"+ str(i) +"-1.html",))        t.start()