标签：生成 rip script python location first ons 发送 div
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。
已经快一个月了。python小有进展。现在研究scrapy项目。
标签：生成 rip script python location first ons 发送 div
原文地址：http://www.cnblogs.com/ifillbad/p/7852911.html
