如何修复CSV/JSON的废字典输出格式

Question

我的代码在下面。我想把结果提取到CSV。然而，scrapy的结果是一个有2个键的字典，所有的值都集中在每个键中。输出看起来不好。 我怎么解决这个问题。这可以通过管道/项目加载器等来实现吗。。。在

非常感谢。在

import scrapy
from scrapy.linkextractors import LinkExtractor
from scrapy.spiders import CrawlSpider, Rule
from scrapy.loader import ItemLoader
from scrapy.loader.processors import TakeFirst, MapCompose, Join
from gumtree1.items import GumtreeItems

class AdItemLoader(ItemLoader):
    jobs_in = MapCompose(unicode.strip)

class GumtreeEasySpider(CrawlSpider):
    name = 'gumtree_easy'
    allowed_domains = ['gumtree.com.au']
    start_urls = ['http://www.gumtree.com.au/s-jobs/page-2/c9302?ad=offering']

    rules = (
        Rule(LinkExtractor(restrict_xpaths='//a[@class="rs-paginator-btn next"]'), callback='parse_item', follow=True),
    )

    def parse_item(self, response):
        loader = AdItemLoader(item=GumtreeItems(), response=response)
        loader.add_xpath('jobs','//div[@id="recent-sr-title"]/following-sibling::*//*[@itemprop="name"]/text()')
        loader.add_xpath('location', '//div[@id="recent-sr-title"]/following-sibling::*//*[@class="rs-ad-location-area"]/text()')
        yield loader.load_item() 

结果是：

^{pr2}$

应该是这样吗。工作和位置是个人决定的吗？这可以正确地将作业和位置写入CSV，但我发现使用for循环和zip不是最好的方法。在

import scrapy
from gumtree1.items import GumtreeItems

class AussieGum1Spider(scrapy.Spider):
    name = "aussie_gum1"
    allowed_domains = ["gumtree.com.au"]
    start_urls = (
        'http://www.gumtree.com.au/s-jobs/page-2/c9302?ad=offering',
    )

    def parse(self, response):
        item = GumtreeItems()
        jobs = response.xpath('//div[@id="recent-sr-title"]/following-sibling::*//*[@itemprop="name"]/text()').extract()
        location = response.xpath('//div[@id="recent-sr-title"]/following-sibling::*//*[@class="rs-ad-location-area"]/text()').extract()
        for j, l in zip(jobs, location):
            item['jobs'] = j.strip()
            item['location'] = l
            yield item

部分结果如下。在

2016-03-16 02:20:46 [scrapy] DEBUG: Crawled (200) <GET http://www.gumtree.com.au/s-jobs/page-3/c9302?ad=offering> (referer: http://www.gumtree.com.au/s-jobs/page-2/c9302?ad=offering)
2016-03-16 02:20:46 [scrapy] DEBUG: Scraped from <200 http://www.gumtree.com.au/s-jobs/page-3/c9302?ad=offering>
{'jobs': u'Live In Au pair-Urgent', 'location': u'Wanneroo Area'}
2016-03-16 02:20:46 [scrapy] DEBUG: Scraped from <200 http://www.gumtree.com.au/s-jobs/page-3/c9302?ad=offering>
{'jobs': u'live in carer', 'location': u'Fraser Coast'}
2016-03-16 02:20:46 [scrapy] DEBUG: Scraped from <200 http://www.gumtree.com.au/s-jobs/page-3/c9302?ad=offering>
{'jobs': u'Mental Health Nurse', 'location': u'Perth Region'}
2016-03-16 02:20:46 [scrapy] DEBUG: Scraped from <200 http://www.gumtree.com.au/s-jobs/page-3/c9302?ad=offering>
{'jobs': u'Experienced NBN pit and pipe installers/node and cabinet wor...',
 'location': u'Marrickville Area'}
2016-03-16 02:20:46 [scrapy] DEBUG: Scraped from <200 http://www.gumtree.com.au/s-jobs/page-3/c9302?ad=offering>
{'jobs': u'Delivery Driver / Pizza Maker Job - Dominos Pizza',
 'location': u'Hurstville Area'}

非常感谢。在

Answer 1

为每个项都有一个父选择器，并提取与其相关的job和{}：

rows = response.xpath('//div[@id="recent-sr-title"]/following-sibling::*')
for row in rows:
    item = GumtreeItems()
    item['jobs'] = row.xpath('.//*[@itemprop="name"]/text()').extract_first().strip()
    item['location'] = row.xpath('.//*[@class="rs-ad-location-area"]/text()').extract_first().strip()
    yield item

Answer 2

老实说，使用for循环是正确的方法，但您可以在管道上解决它：

from scrapy.http import Response
from gumtree1.items import GumtreeItems, CustomItem
from scrapy.exceptions import DropItem


class CustomPipeline(object):

    def __init__(self, crawler):
        self.crawler = crawler

    @classmethod
    def from_crawler(cls, crawler):
        return cls(crawler)

    def process_item(self, item, spider):
        if isinstance(item, GumtreeItems):
            for i, jobs in enumerate(item['jobs']):
                self.crawler.engine.scraper._process_spidermw_output(
                    CustomItem(jobs=jobs, location=item['location'][i]), None, Response(''), spider)
            raise DropItem("main item dropped")
        return item

同时添加自定义项：

^{pr2}$

希望这有帮助，再次我认为你应该使用循环。在