已经快一个月了。python小有进展。现在研究scrapy项目。

刚刚研究学习了一个新的技能，觉得自己水平又升了一级。就是跨页面item 抓取的问题。以前一直不明白。代码如下！

item申明如下：

import scrapy


class QuotesItem(scrapy.Item):
    quote = scrapy.Field()
    author = scrapy.Field()
    tags = scrapy.Field()

    author_born_date = scrapy.Field()
    author_born_location = scrapy.Field()
    author_description = scrapy.Field()
    author_full_url = scrapy.Field()

spider.py如下

import scrapy
from quotes_2.items import QuotesItem

class QuotesSpider(scrapy.Spider):
    name = 'quotes_2_6'
    start_urls = [
'http://quotes.toscrape.com',
    ]
    allowed_domains = [
'toscrape.com',
    ]

def parse(self,response):
for quote in response.css('div.quote'):
            item = QuotesItem()
            item['quote'] = quote.css('span.text::text').extract_first()
            item['author'] = quote.css('small.author::text').extract_first()
            item['tags'] = quote.css('div.tags a.tag::text').extract()
            author_page = response.css('small.author+a::attr(href)').extract_first()
            item['author_full_url'] = response.urljoin(author_page)



yield scrapy.Request(url=item['authro_full_url'], meta={'item':item},callback=self.parse_author,dont_filter=True)

        next_page = response.css('li.next a::attr("href")').extract_first()
if next_page is not None:
            next_full_url = response.urljoin(next_page)
yield scrapy.Request(next_full_url, callback=self.parse)            



def parse_author(self,response):
        item = response.meta['item']
        item['author_born_date'] = response.css('.author-born-date::text').extract_first()
        item['author_born_location'] = response.css('.author-born-location::text').extract_first()
        item['author_description'] = response.css('.author-born-location::text').extract_first()        
yield item

  """通过meta参数，把item这个字典，赋值给meta中的'item'键（记住meta本身也是一个字典）。
      Scrapy.Request请求url后生成一个"Request对象"，这个meta字典（含有键值'key'，'key'的值也是一个字典，即item）
      会被“放”在"Request对象"里一起发送给parse2()函数 """
item = response.meta['item']# """这个response已含有上述meta字典，此句将这个字典赋值给item，

dont_filter=True  将去重关闭。