CODE EXAMPLE FOR PYTHON

scrapy itemloader example

def parse_item(self, response):

        loader = ItemLoader(ChsiDaxueItem(), response)
        loader.add_value('id', response.url, re=ur'schId-(w+).dhtml')
        loader.add_value('url', response.url)
        loader.add_css('logo', u'.r_c_sch_logo>img::attr(src)', MapCompose(lambda url: urljoin('http://gaokao.chsi.com.cn/', url)))
        loader.add_css('name', u'.topImg::text')
        loader.add_css('badges', u'.r_c_sch_attr .r_c_sch_icon::attr(title)')

        data_clean = MapCompose(lambda x: re.sub(r's+', ' ', x), unicode.strip)
        loader.add_xpath('type', u'//span[@class="f_bold" and .="?????"]/following-sibling::text()', data_clean)
        loader.add_xpath('membership', u'//span[@class="f_bold" and .="?????"]/following-sibling::text()', data_clean)
        loader.add_xpath('province', u'//span[@class="f_bold" and span]/following-sibling::text()', data_clean)
        loader.add_xpath('address', u'//span[@class="f_bold" and .="?????"]/following-sibling::text()', data_clean)
        loader.add_xpath('phone', u'//span[@class="f_bold" and .="?????"]/following-sibling::text()', data_clean)
        loader.add_xpath('website', u'//span[@class="f_bold" and .="?????"]/following-sibling::a/@href', data_clean)
        loader.add_xpath('backdoor', u'//span[@class="f_bold" and .="?????"]/following-sibling::text()', data_clean)

        def parse_votes():
            xpath = u'//td[@class="tdMydT" and .="{}"]/following-sibling::td/div[@class="rank"]/@rank'
            get_vote = lambda what: float(response.xpath(xpath.format(what)).extract_first() or 0)
            return {
                'overall': get_vote(u'?????'),
                'environment': get_vote(u'???????'),
                'life': get_vote(u'?????'),
            }

        loader.add_value('votes', parse_votes())

        def parse_trending():
            css = u'{}>table tr:not(:first-child)'
            def get_trending(what):
                majors = []
                for e in response.css(css.format(what)):
                    majors.append({
                        'id': e.css(u'.tdZytjTDiv>a::attr(href)').re_first(r'specId=(w+)'),
                        'name': e.css(u'.tdZytjTDiv::attr(title)').extract_first(),
                        'vote': float(e.css(u'.avg_rank::text').extract_first()),
                        'count': int(e.css(u'.c_f00::text, .red::text').extract_first()),
                    })
                return majors
            return {
                'count': get_trending(u'#topNoofPTable'),
                'index': get_trending(u'#topIndexTable'),
                'like': get_trending(u'.r_r_box_zymyd'),
            }

        loader.add_value('trending', parse_trending())

        item = loader.load_item()

        for link in LinkExtractor(restrict_xpaths=u'//ul[@id="topNav"]//a[.="????"]').extract_links(response):
            yield Request(link.url, meta={'item': item}, callback=self.parse_jianjie)