scrapy多级请求中priority设置

标签：priority1 self 多级 priority scrapy priority2 func

基于优先获取item的想法,最下级请求最优先

请求优先级是基于scrapy有很多请求要发起的情况

priority越大请求越优先

不在设置中修改配置

scrapy代码太复杂,这是目前可以接受的解决办法

class xxxspiderSpider(scrapy.Spider):
    # 三级请求优先级逐级递减
    priority1 = 100000000
    priority2 = priority1 * 10000
    priority3 = priority2 * 10000

    def start_requests(self):
        yield scrapy.http.Request(第一级url,callback=self.第一级爬取,priority=self.priority1_func())

    def 第一级爬取(self, response):
        for i in 第二级url列表:
            yield scrapy.http.Request(url=第二级url,callback=self.第二级爬取,priority=self.priority2_func())

        yield scrapy.http.Request(第一级下一页url,callback=self.第一级爬取,priority=self.priority1_func())


    def 第二级爬取(self, response):
        for i in 第三级url列表:
            yield scrapy.http.Request(第三级url,callback=self.第三级爬取,priority=self.priority3_func())

        yield scrapy.http.Request(第二级下一页url,callback=self.第二级爬取,priority=self.priority2_func())

    def 第三级爬取(self, response):
        yield item

    def priority1_func(self):
        self.priority1 = self.priority1 -1
        return self.priority1

    def priority2_func(self):
        self.priority2 = self.priority2 -1
        return self.priority2

    def priority3_func(self):
        self.priority3 = self.priority3 -1
        return self.priority3

标签：priority1,self,多级,priority,scrapy,priority2,func
From： https://www.cnblogs.com/meizhengchao/p/16591718.html