爬虫（scrapy--豆瓣TOP250）

# -*- coding: utf-8 -*-
import scrapy
from douban_top250.items import DoubanTop250Item

class MovieSpider(scrapy.Spider):
    name = 'movie'
    header = {
        "User-Agent": "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.109 Safari/537.36"
    }

    def start_requests(self):

        urls = 'https://movie.douban.com/top250'
        yield scrapy.Request(url=urls,headers=self.header)

    def parse(self, response):
        item = DoubanTop250Item()
        info = response.xpath("//*[@id='content']/div/div[1]/ol/li")
        for each in info:
            item['ranking'] = each.xpath("div/div[1]/em/text()").extract()
            item['name'] = each.xpath("div/div[2]/div[1]/a/span[1]/text()").extract()
            item['grade'] = each.xpath("div/div[2]/div[2]/div/span[2]/text()").extract()
            item['score_num'] = each.xpath("div/div[2]/div[2]/div/span[4]/text()").extract()
            yield item
        next_url = response.xpath("//*[@id='content']/div/div[1]/div[2]/span[3]/link/@href").extract()
        if next_url:
            next_url = 'https://movie.douban.com/top250' + next_url[0]
            yield scrapy.Request(next_url,headers=self.header)