描述
项目对象是Python的常规词汇.我们可以使用以下语法来访问类的属性 :
>>> item = DmozItem()>>> item['title'] = 'sample title'>>> item['title']'sample title'
将以上代码添加到以下示例中 :
import scrapyfrom tutorial.items import DmozItemclass MyprojectSpider(scrapy.Spider): name = "project" allowed_domains = ["dmoz.org"] start_urls = [ "http://www.dmoz.org/Computers/Programming/Languages/Python/Books/", "http://www.dmoz.org/Computers/Programming/Languages/Python/Resources/" ] def parse(self, response): for sel in response.xpath('//ul/li'): item = DmozItem() item['title'] = sel.xpath('a/text()').extract() item['link'] = sel.xpath('a/@href').extract() item['desc'] = sel.xpath('text()').extract() yield item上述蜘蛛的输出为 :
[scrapy] DEBUG: Scraped from <200 http://www.dmoz.org/Computers/Programming/Languages/Python/Books/> {'desc': [u' - By David Mertz; Addison Wesley. Book in progress, full text, ASCII format. Asks for feedback. [author website, Gnosis Software, Inc.\n], 'link': [u'http://gnosis.cx/TPiP/'], 'title': [u'Text Processing in Python']}[scrapy] DEBUG: Scraped from <200 http://www.dmoz.org/Computers/Programming/Languages/Python/Books/> {'desc': [u' - By Sean McGrath; Prentice Hall PTR, 2000, ISBN 0130211192, has CD-ROM. Methods to build XML applications fast, Python tutorial, DOM and SAX, new Pyxie open source XML processing library. [Prentice Hall PTR]\n'], 'link': [u'http://www.informit.com/store/product.aspx?isbn=0130211192'], 'title': [u'XML Processing with Python']}