Question

我正在尝试废弃信息，我正在寻找的信息可以通过搜索地址访问： [http://www.sec.gov/cgi-bin/srch-edgar?text=form-type%3Dd+and+state%3DMN&first=2008&last=2011] [1]

我希望scrapy遵循书面链接（让我们尝试一个然后我会寻找生成与之关联的数字）一个链接的Xpath是：

/html/body/div/table/tbody/tr[29]/td[3]/a[2]

抓取到此链接后，我希望抓取抓取到下一页上提供的xml文件。链接的Xpath是通用的：

//*[@id="formDiv"]/div/table/tbody/tr[3]/td[3]/a

最后我希望scrapy从xml页面中删除一些数据。

启动Scrapy：scrapy crawl DFORM -o items.json -t json 我得到的所有json文件都是：“[”。

的 items.py 的

from scrapy.item import Item, Field

class SecformD(Item):
    company = Field()
    filling_date = Field()
    types_of_securities = Field()
    offering_amount = Field()
    sold_amount = Field()
    remaining = Field()
    investors_accredited = Field()
    investors_non_accredited = Field()

*的 Formds_Crawler.py *

from scrapy.contrib.spiders import BaseSpider, Rule
from scrapy.contrib.linkextractors.sgml import SgmlLinkExtractor
from scrapy.selector import HtmlXPathSelector
from scrapy.selector import XmlXPathSelector
from formds.items import SecformD


class SecDform(CrawlSpider):
    name = "DFORM"
    allowed_domain = ["http://www.sec.gov"]
    start_urls = [
        "http://www.sec.gov/cgi-bin/srch-edgar?text=form-type%3Dd+and+state%3DMN&first=2008&last=2011"
        ]
    rules = (
        Rule(SgmlLinkExtractor(restrict_xpaths=('/html/body/div/table/tbody/tr[27]/td[3]/a[2]')), callback='parse_formd', follow= True),)


def parse_formd(self, response):
    xxs = XMLPathSelector(response)
    hsx = HtmlXPathSelector(response)

    sites = xxs.select('//*[@id="formDiv"]/div/table/tbody/tr[3]/td[3]/a')
    items = []
    for site in sites:
        item = SecFormD()
        item['company'] = site.select('//*[@id="collapsible1"]/div[1]/div[2]/div[2]/span[2]/text()').extract()
        item['filling_date'] = site.select('//*[@id="collapsible40"]/div[1]/div[2]/div[5]/span[2]/text()').extract()
        item['types_of_securities'] = site.select('//*[@id="collapsible37"]/div[1]/div[2]/div[1]/span[2]/text()').extract()
        item['offering_amount'] = site.select('//*[@id="collapsible39"]/div[1]/div[2]/div[1]/span[2]/text()').extract()
        item['sold_amount'] = site.select('//*[@id="collapsible39"]/div[1]/div[2]/div[2]/span[2]/text()').extract()
        item['remaining'] = site.select('//*[@id="collapsible39"]/div[1]/div[2]/div[3]/span[2]/text()').extract()
        item['investors_accredited'] = site.select('//*[@id="collapsible40"]/div[1]/div[2]/div[2]/span[2]/text()').extract()
        item['investors_non_accredited'] = site.select('//*[@id="collapsible40"]/div[1]/div[2]/div[1]/span[2]/text()').extract()

        items.append(item)
    return items


***Here is the log:***
USComputer:formds psykoboy$ scrapy crawl DFORM -o items.json -t json
2013-07-18 21:18:37-0500 [scrapy] INFO: Scrapy 0.16.4 started (bot: formds)
2013-07-18 21:18:38-0500 [scrapy] DEBUG: Enabled extensions: FeedExporter, LogStats, TelnetConsole, CloseSpider, WebService, CoreStats, SpiderState
2013-07-18 21:18:38-0500 [scrapy] DEBUG: Enabled downloader middlewares: HttpAuthMiddleware, DownloadTimeoutMiddleware, UserAgentMiddleware, RetryMiddleware, DefaultHeadersMiddleware, RedirectMiddleware, CookiesMiddleware, HttpCompressionMiddleware, ChunkedTransferMiddleware, DownloaderStats
2013-07-18 21:18:38-0500 [scrapy] DEBUG: Enabled spider middlewares: HttpErrorMiddleware, OffsiteMiddleware, RefererMiddleware, UrlLengthMiddleware, DepthMiddleware
2013-07-18 21:18:38-0500 [scrapy] DEBUG: Enabled item pipelines: 
2013-07-18 21:18:38-0500 [DFORM] INFO: Spider opened
2013-07-18 21:18:38-0500 [DFORM] INFO: Crawled 0 pages (at 0 pages/min), scraped 0 items (at 0 items/min)
2013-07-18 21:18:38-0500 [scrapy] DEBUG: Telnet console listening on 0.0.0.0:6023
2013-07-18 21:18:38-0500 [scrapy] DEBUG: Web service listening on 0.0.0.0:6080
2013-07-18 21:18:42-0500 [DFORM] DEBUG: Crawled (200) <GET http://www.sec.gov/cgi-bin/srch-edgar?text=form-type%3Dd%20and%20state%3DMN&start=81&count=80&first=2008&last=2011> (referer: None)
2013-07-18 21:18:43-0500 [DFORM] DEBUG: Crawled (200) <GET http://www.sec.gov/cgi-bin/srch-edgar?text=form-type%3Dd+and+state%3DMN&first=2008&last=2011> (referer: None)
2013-07-18 21:18:44-0500 [DFORM] DEBUG: Crawled (200) <GET http://www.sec.gov/cgi-bin/srch-edgar?text=form-type%3Dd%20and%20state%3DMN&start=161&count=80&first=2008&last=2011> (referer: None)
2013-07-18 21:18:45-0500 [DFORM] DEBUG: Crawled (200) <GET http://www.sec.gov/cgi-bin/srch-edgar?text=form-type%3Dd%20and%20state%3DMN&start=241&count=80&first=2008&last=2011> (referer: None)
2013-07-18 21:18:45-0500 [DFORM] DEBUG: Crawled (200) <GET http://www.sec.gov/cgi-bin/srch-edgar?text=form-type%3Dd%20and%20state%3DMN&start=321&count=80&first=2008&last=2011> (referer: None)
2013-07-18 21:18:46-0500 [DFORM] DEBUG: Crawled (200) <GET http://www.sec.gov/cgi-bin/srch-edgar?text=form-type%3Dd%20and%20state%3DMN&start=401&count=80&first=2008&last=2011> (referer: None)
2013-07-18 21:18:46-0500 [DFORM] DEBUG: Crawled (200) <GET http://www.sec.gov/cgi-bin/srch-edgar?text=form-type%3Dd%20and%20state%3DMN&start=481&count=80&first=2008&last=2011> (referer: None)
2013-07-18 21:18:47-0500 [DFORM] DEBUG: Crawled (200) <GET http://www.sec.gov/cgi-bin/srch-edgar?text=form-type%3Dd%20and%20state%3DMN&start=561&count=80&first=2008&last=2011> (referer: None)
2013-07-18 21:18:47-0500 [DFORM] DEBUG: Crawled (200) <GET http://www.sec.gov/cgi-bin/srch-edgar?text=form-type%3Dd%20and%20state%3DMN&start=641&count=80&first=2008&last=2011> (referer: None)
2013-07-18 21:18:48-0500 [DFORM] DEBUG: Crawled (200) <GET http://www.sec.gov/cgi-bin/srch-edgar?text=form-type%3Dd%20and%20state%3DMN&start=721&count=80&first=2008&last=2011> (referer: None)
2013-07-18 21:18:48-0500 [DFORM] DEBUG: Crawled (200) <GET http://www.sec.gov/cgi-bin/srch-edgar?text=form-type%3Dd%20and%20state%3DMN&start=721&count=80&first=2008&last=2011> (referer: None)
2013-07-18 21:18:48-0500 [DFORM] INFO: Closing spider (finished)
2013-07-18 21:18:48-0500 [DFORM] INFO: Dumping Scrapy stats:
    {'downloader/request_bytes': 3419,
     'downloader/request_count': 11,
     'downloader/request_method_count/GET': 11,
     'downloader/response_bytes': 68182,
     'downloader/response_count': 11,
     'downloader/response_status_count/200': 11,
     'finish_reason': 'finished',
     'finish_time': datetime.datetime(2013, 7, 19, 2, 18, 48, 189346),
     'log_count/DEBUG': 17,
     'log_count/INFO': 4,
     'response_received_count': 11,
     'scheduler/dequeued': 11,
     'scheduler/dequeued/memory': 11,
     'scheduler/enqueued': 11,
     'scheduler/enqueued/memory': 11,
     'start_time': datetime.datetime(2013, 7, 19, 2, 18, 38, 701571)}
2013-07-18 21:18:48-0500 [DFORM] INFO: Spider closed (finished)

Answer 1

如果您删除了tbody/ ，您的前两个XPath表达式可以在scrapy shell中使用

paul@wheezy:~$ scrapy shell 'http://www.sec.gov/cgi-bin/srch-edgar?text=form-type%3Dd+and+state%3DMN&first=2008&last=2011'
...
In [1]: hxs.select('/html/body/div/table/tr[27]/td[3]/a[2]/@href').extract()
Out[1]: [u'/Archives/edgar/data/1490747/000149074710000001/0001490747-10-000001-index.htm']
In [2]: next = hxs.select('/html/body/div/table/tr[27]/td[3]/a[2]/@href').extract()[0]
In [3]: import urlparse
In [4]: next_url = urlparse.urljoin(response.url, next)
In [5]: next_url
Out[5]: u'http://www.sec.gov/Archives/edgar/data/1490747/000149074710000001/0001490747-10-000001-index.htm'
In [6]: fetch(next_url)
2013-07-19 09:42:58+0200 [default] DEBUG: Crawled (200) <GET http://www.sec.gov/Archives/edgar/data/1490747/000149074710000001/0001490747-10-000001-index.htm> (referer: None)
...
In [8]: hxs.select('//*[@id="formDiv"]/div/table/tr[3]/td[3]/a')
Out[8]: [<HtmlXPathSelector xpath='//*[@id="formDiv"]/div/table/tr[3]/td[3]/a' data=u'<a href="/Archives/edgar/data/1490747/00'>]

但是

sites = xxs.select('//*[@id="formDiv"]/div/table/tbody/tr[3]/td[3]/a')
items = []
for site in sites:
    ... extract item values

部分不是你的意思。

您想要关注XML文档的链接，并解析它们，因此，您需要告诉Scrapy获取这些页面，sites = xxs.select('//*[@id="formDiv"]/div/table/tbody/tr[3]/td[3]/a')不会这样做，它会返回a标记，它不会发出获取文档的请求

您需要以下内容：

import urlparse
from scrapy.http import Request
...
class SecDform(CrawlSpider):
    ...
    def parse_formd(self, response):
        hxs = HtmlXPathSelector(response)
        sites = hxs.select('//*[@id="formDiv"]/div/table/tr[3]/td[3]/a/@href').extract()
        for site in sites:
            yield Request(url=urlparse.urljoin(response.url, site), callback=self.parse_xml_document)

定义一个新的parse_xml_document()回调方法，其中包含这些XML文档的项提取逻辑。

您的商品字段的XPath表达式来自Chrome或Firebug资源管理器，对吧？（“collapsibla0”等）。您需要的是直接处理XML结构，而不是浏览器转换为HTML以显示的内容。我只做了“公司”部分来说明。

    def parse_xml_document(self, response):
        xxs = XmlXPathSelector(response)
        item = SecFormD()
        item["company"] = xxs.select('./primaryIssuer/entityName/text()').extract()[0]
        ...
        return item

使用scrapy shell <url_of_xml_document>处理您的项目的XPath表达式的好方法，就像我在“公司”中所做的那样（另请参阅http://doc.scrapy.org/en/latest/intro/tutorial.html#trying-selectors-in-the-shell）

paul@wheezy:~$ scrapy shell http://www.sec.gov/Archives/edgar/data/1490747/000149074710000001/primary_doc.xml
In [6]: xxs.select('./primaryIssuer')
Out[6]: [<XmlXPathSelector xpath='./primaryIssuer' data=u'<primaryIssuer>\n        <cik>0001490747<'>]

In [7]: xxs.select('./primaryIssuer/entityName')
Out[7]: [<XmlXPathSelector xpath='./primaryIssuer/entityName' data=u'<entityName>AEI CREDIT TENANT FUND 35 LP'>]

In [8]: xxs.select('./primaryIssuer/entityName/text()')
Out[8]: [<XmlXPathSelector xpath='./primaryIssuer/entityName/text()' data=u'AEI CREDIT TENANT FUND 35 LP'>]

In [9]: xxs.select('./primaryIssuer/entityName/text()').extract()
Out[9]: [u'AEI CREDIT TENANT FUND 35 LP']

In [10]:

编辑：使用Rules（）更新gist以关注[NEXT]页面并链接到所有行中的文档 https://gist.github.com/redapple/02a55aa6aaac0df2fb75

使用Xpath进行更深层次的Scrapy

1 个答案: