Scrapy请求传参

# -*- coding: utf-8 -*-
‘‘‘
要抓取的数据部分在一级页面、一部分在二级页面
‘‘‘
import scrapy
from movie.items import MovieItem

class MvSpider(scrapy.Spider):
# 爬虫文件的名字
name = ‘mv‘
# 允许的域名
allowed_domains = [‘www.ygdy8.net‘]
# 起始的url
start_urls = [‘http://www.ygdy8.net/html/gndy/dyzz/index.html‘]
def parse(self, response):
a_list = response.xpath(‘//div[@class="co_content8"]//table//a‘)
for a in a_list:
title = a.xpath(‘./text()‘).extract_first()
href = ‘http://www.ygdy8.net‘ + a.xpath(‘./@href‘).extract_first()
movie = MovieItem(title=title)
# callback是执行的方法 meta是响应时候携带的参数
yield scrapy.Request(url=href,callback=self.parse_detail,meta={‘movie‘:movie})

def parse_detail(self,response):
movie = response.meta[‘movie‘]
src = response.xpath(‘//div[@id="Zoom"]//p[1]/img[1]/@src‘).extract_first()
movie[‘src‘]=src
yield movie