Scrapy beendet unerwartet

Question

Ich folge Buch von O'Reilly veröffentlicht eine Spinne wie unten zu erstellen: articleSpider.py

from scrapy.spiders import CrawlSpider, Rule 
from TestScrapy.items import Article 
from scrapy.linkextractors import LinkExtractor 

class ArticleSpider(CrawlSpider): 
    name = "article" 
    allowed_domains = ["en.wikipedia.org"] 
    start_urls = ["https://en.wikipedia.org/wiki/Object-oriented_programming"] 
    rules = [Rule(LinkExtractor(allow=('(/wiki/)((?!:).)*$'),),callback="parse_item", follow=True)] 
    def parse(self, response): 
     item = Article() 
     title = response.xpath('//h1/text()')[0].extract() 
     print "Title is:" + title 
     item['title'] = title 
     return item 

Items.py

from scrapy import Item, Field 

class Article(Item): 
    # define the fields for your item here like: 
    # name = scrapy.Field() 
    title = Field() 

Allerdings, wenn ich diese Spinne laufen, es zeigt nur ein Ergebnis an und endet. Ich erwarte, dass es läuft, bis ich es beende.

sehen Sie das Ergebnis und Debug-Informationen aus Scrapy:

2016-06-06 15:45:28 [scrapy] INFO: Scrapy 1.0.3 started (bot: TestScrapy) 
2016-06-06 15:45:28 [scrapy] INFO: Optional features available: ssl, http11 
2016-06-06 15:45:28 [scrapy] INFO: Overridden settings: {'NEWSPIDER_MODULE': 'TestScrapy.spiders', 'SPIDER_MODULES': ['TestScrapy.spiders'], 'BOT_NAME': 'TestScrapy'} 
2016-06-06 15:45:29 [scrapy] INFO: Enabled extensions: CloseSpider, TelnetConsole, LogStats, CoreStats, SpiderState 
2016-06-06 15:45:30 [scrapy] INFO: Enabled downloader middlewares: HttpAuthMiddleware, DownloadTimeoutMiddleware, UserAgentMiddleware, RetryMiddleware, DefaultHeadersMiddleware, MetaRefreshMiddleware, HttpCompressionMiddleware, RedirectMiddleware, CookiesMiddleware, ChunkedTransferMiddleware, DownloaderStats 
2016-06-06 15:45:30 [scrapy] INFO: Enabled spider middlewares: HttpErrorMiddleware, OffsiteMiddleware, RefererMiddleware, UrlLengthMiddleware, DepthMiddleware 
2016-06-06 15:45:30 [scrapy] INFO: Enabled item pipelines: 
2016-06-06 15:45:30 [scrapy] INFO: Spider opened 
2016-06-06 15:45:30 [scrapy] INFO: Crawled 0 pages (at 0 pages/min), scraped 0 items (at 0 items/min) 
2016-06-06 15:45:30 [scrapy] DEBUG: Telnet console listening on 127.0.0.1:6023 
2016-06-06 15:45:33 [scrapy] DEBUG: Crawled (200) <GET https://en.wikipedia.org/wiki/Object-oriented_programming> (referer: None) 
Title is:Object-oriented programming 
2016-06-06 15:45:33 [scrapy] DEBUG: Scraped from <200 https://en.wikipedia.org/wiki/Object-oriented_programming> 
{'title': u'Object-oriented programming'} 
2016-06-06 15:45:33 [scrapy] INFO: Closing spider (finished) 
2016-06-06 15:45:33 [scrapy] INFO: Dumping Scrapy stats: 
{'downloader/request_bytes': 246, 
'downloader/request_count': 1, 
'downloader/request_method_count/GET': 1, 
'downloader/response_bytes': 51238, 
'downloader/response_count': 1, 
'downloader/response_status_count/200': 1, 
'finish_reason': 'finished', 
'finish_time': datetime.datetime(2016, 6, 6, 7, 45, 33, 441000), 
'item_scraped_count': 1, 
'log_count/DEBUG': 3, 
'log_count/INFO': 7, 
'response_received_count': 1, 
'scheduler/dequeued': 1, 
'scheduler/dequeued/memory': 1, 
'scheduler/enqueued': 1, 
'scheduler/enqueued/memory': 1, 
'start_time': datetime.datetime(2016, 6, 6, 7, 45, 30, 614000)} 
2016-06-06 15:45:33 [scrapy] INFO: Spider closed (finished) 

Answer 1

Ändern Sie den Methodennamen parse-parse_item.

Jetzt kriechen Sie nur die Start-URL, aber beim Filtern der Regeln gibt es keine Methode zum Rückruf, also beendet die Spinne die Ausführung.

prüfen dieses Beispiel CrawlSpider: http://doc.scrapy.org/en/latest/topics/spiders.html#crawlspider-example

Answer 2

Sie auch start_product_requests statt parse hier verwenden können.