Question

使用二进制WinPython-32bit-2.7.6.2，Scrapy 0.22.0，Eclipse 4.2.1和Twisted-13.2.0.win32-py2.7反应堆在Windows 7上运行Python 2.7.6.2

我正在学习scrapy。我做了所有事情除了正确调用pipelines.process_item（）。它正在调用pipelines.open_spider（）和pipelines.close_spider（）确定。

我认为这是因为蜘蛛没有生成任何“项目”信号（不是item_passed，item_dropped或item_scraped）。

我添加了一些代码来尝试捕获这些信号，当我尝试捕获上述3个项目信号中的任何一个时，我什么都没得到。

代码捕获其他信号（如engine_started或spider_closed等）。

如果我尝试设置item ['doesnotexist']变量，它也会出错，因此它似乎使用items文件和我的用户定义的项目类“AuctionDOTcomItems”。

真的不知所措。我非常感谢任何帮助...

A）使pipelines.process_item（）正常工作OR ...

B）能够手动捕获已设置项目的信号，因此我可以将控制权传递给我自己的pipelines.process_item（）版本。

反应器：

from twisted.internet import reactor
from scrapy.crawler import Crawler
from scrapy import log, signals
from scrapy.utils.project import get_project_settings

class SpiderRun:
    def __init__(self, spider):
        settings = get_project_settings()
        mySettings = {'ITEM_PIPELINES': {'estatescraper.pipelines.EstatescraperXLSwriter':300}} 
        settings.overrides.update(mySettings)

        crawler = Crawler(settings)
        crawler.signals.connect(reactor.stop, signal=signals.spider_closed)
        crawler.configure()
        crawler.crawl(spider)
        crawler.start()
#         log.start()
        reactor.run() # the script will block here until the spider_closed signal was sent
        self.cleanup()

    def cleanup(self):
        print "SpiderRun done" #333
        pass

if __name__ == "__main__":
    from estatescraper import AuctionDOTcom
    spider = AuctionDOTcom()
    r = SpiderRun(spider)

蜘蛛：

from scrapy.xlib.pydispatch import dispatcher
from scrapy.http import Request
from scrapy.selector import Selector
from scrapy import signals
from scrapy.spider import Spider

from auctiondotcomurls import AuctionDOTcomURLs
from auctiondotcomitems import AuctionDOTcomItems
from auctiondotcomgetitems import AuctionDOTcomGetItems

import urlparse
import time 

import sys

class AuctionDOTcom(Spider):
    def __init__(self,
                 limit = 50, 
                 miles = 250,
                 zip = None, 
                 asset_types = "",
                 auction_types = "", 
                 property_types = ""):
        self.name = "auction.com"
        self.allowed_domains = ["auction.com"]
        self.start_urls = AuctionDOTcomURLs(limit, miles, zip, asset_types, 
                                            auction_types, property_types)

        dispatcher.connect(self.testsignal, signals.item_scraped) 

#     def _item_passed(self, item):
#         print "item = ", item #333  

    def testsignal(self):
        print "in csvwrite" #333

    def parse(self, response):
        sel = Selector(response)
        listings =  sel.xpath('//div[@class="contentDetail searchResult"]')
        for listing in listings:
            item = AuctionDOTcomItems()

            item['propertyID'] = ''.join(set(listing.xpath('./@property-id').extract()))
            print "item['propertyID'] = ", item['propertyID'] #333
#             item = AuctionDOTcomGetItems(listing)

#         ################
#         # DEMONSTRATTION ONLY
#             print "######################################"            
#             for i in item:
#                 print i + ": " + str(item[i])

        next = set(sel.xpath('//a[contains(text(),"Next")]//@href').extract())

        for i in next:
            yield Request("http://%s/%s" % (urlparse.urlparse(response.url).hostname, i), callback=self.parse)


if __name__ == "__main__":
    from estatescraper import SpiderRun
    from estatescraper import AuctionDOTcom
    spider = AuctionDOTcom()
    r = SpiderRun(spider)

管道：

import csv
from csv import DictWriter

# class TutorialPipeline(object):
#     def process_item(self, item, spider):
#         return item

class EstatescraperXLSwriter(object):
    def __init__(self):
        print "Ive started the __init__ in the pipeline" #333

        self.brandCategoryCsv = csv.writer(open('test.csv', 'wb'),
        delimiter=',', 
        quoting=csv.QUOTE_MINIMAL)
        self.brandCategoryCsv.writerow(['Property ID', 'Asset Type'])

    def open_spider(self, spider):
        print "Hit open_spider in EstatescraperXLSwriter" #333

    def process_item(self, item, spider):
        print "attempting to run process_item" #333
        self.brandCategoryCsv.writerow([item['propertyID'],
                                        item['assetType']])
        return item

    def close_spider(self, spider):
        print "Hit close_spider in EstatescraperXLSwriter" #333
        pass


if __name__ == "__main__":

    o = EstatescraperXLSwriter()

项目：

from scrapy.item import Item, Field

class AuctionDOTcomItems(Item):
    """"""
    propertyID      = Field()  # <uniqueID>ABCD1234</uniqueID>

输出：

Ive started the __init__ in the pipeline
Hit open_spider in EstatescraperXLSwriter
item['propertyID'] =  1590613
item['propertyID'] =  1466738
(...)
item['propertyID'] =  1639764
Hit close_spider in EstatescraperXLSwriter
SpiderRun done

记录输出：

Ive started the __init__ in the pipeline
Hit open_spider in EstatescraperXLSwriter
2014-02-27 17:44:12+0100 [auction.com] INFO: Closing spider (finished)
2014-02-27 17:44:12+0100 [auction.com] INFO: Dumping Scrapy stats:
{'downloader/request_bytes': 240,
 'downloader/request_count': 1,
 'downloader/request_method_count/GET': 1,
 'downloader/response_bytes': 40640,
 'downloader/response_count': 1,
 'downloader/response_status_count/200': 1,
 'finish_reason': 'finished',
 'finish_time': datetime.datetime(2014, 2, 27, 16, 44, 12, 238000),
 'response_received_count': 1,
 'scheduler/dequeued': 1,
 'scheduler/dequeued/memory': 1,
 'scheduler/enqueued': 1,
 'scheduler/enqueued/memory': 1,
 'start_time': datetime.datetime(2014, 2, 27, 16, 44, 9, 203000)}
2014-02-27 17:44:12+0100 [auction.com] INFO: Spider closed (finished)

Answer 1

我没有看到你在def解析中产生项目，只有Request onjects。在某些时候尝试“收益项目”列表中的列表：loop - paul t。 2月27日17:42

scrapy：蜘蛛不生成item_信号

1 个答案: