我在使用 scrapy 时遇到了一些问题。它没有返回任何结果。我试图将以下蜘蛛复制并粘贴到 scrapy shell 中，它确实有效。真的不确定问题出在哪里，但是当我用“scrapy crawl rxomega”运行它时，它不起作用。

from scrapy.selector import Selector
from scrapy.contrib.linkextractors.sgml import SgmlLinkExtractor
from scrapy.contrib.spiders import CrawlSpider, Rule
from iherb.items import IherbItem

class RxomegaSpider(CrawlSpider):
    name = 'rxomega'
    allowed_domains = ['http://www.iherb.com/']
    start_urls = ['http://www.iherb.com/product-reviews/Natural-Factors-RxOmega-3-Factors-EPA-400-mg-DHA-200-mg-240-Softgels/4251/',
            'http://www.iherb.com/product-reviews/Now-Foods-Omega-3-Cardiovascular-Support-200-Softgels/323/']
    #rules = (
    # Rule(SgmlLinkExtractor(allow=r'Items/'), callback='parse_item', follow=True),
    #)

    def parse_item(self, response):
        print('hello')
        sel = Selector(response)
        sites = sel.xpath('//*[@id="mainContent"]/div[3]/div[2]/div')
        items = []
        for site in sites:
            i = IherbItem()
            i['review'] = site.xpath('div[5]/p/text()').extract()
            items.append(i)
        return items

我看到的消息是...scrapy 爬行 rxomega

2014-02-16 17:00:55-0800 [scrapy] INFO: Scrapy 0.22.0 started (bot: iherb)
2014-02-16 17:00:55-0800 [scrapy] INFO: Optional features available: ssl, http11, django
2014-02-16 17:00:55-0800 [scrapy] INFO: Overridden settings: {'NEWSPIDER_MODULE': 'iherb.spiders', 'SPIDER_MODULES': ['iherb.spiders'], 'BOT_NAME': 'iherb'}
2014-02-16 17:00:55-0800 [scrapy] INFO: Enabled extensions: LogStats, TelnetConsole, CloseSpider, WebService, CoreStats, SpiderState
2014-02-16 17:00:55-0800 [scrapy] INFO: Enabled downloader middlewares: HttpAuthMiddleware, DownloadTimeoutMiddleware, UserAgentMiddleware, RetryMiddleware, DefaultHeadersMiddleware, MetaRefreshMiddleware, HttpCompressionMiddleware, RedirectMiddleware, CookiesMiddleware, ChunkedTransferMiddleware, DownloaderStats
2014-02-16 17:00:55-0800 [scrapy] INFO: Enabled spider middlewares: HttpErrorMiddleware, OffsiteMiddleware, RefererMiddleware, UrlLengthMiddleware, DepthMiddleware
2014-02-16 17:00:55-0800 [scrapy] INFO: Enabled item pipelines:
2014-02-16 17:00:55-0800 [rxomega] INFO: Spider opened
2014-02-16 17:00:55-0800 [rxomega] INFO: Crawled 0 pages (at 0 pages/min), scraped 0 items (at 0 items/min)
2014-02-16 17:00:55-0800 [scrapy] DEBUG: Telnet console listening on 0.0.0.0:6026
2014-02-16 17:00:55-0800 [scrapy] DEBUG: Web service listening on 0.0.0.0:6083
2014-02-16 17:00:55-0800 [rxomega] DEBUG: Crawled (200)  (referer: None)
2014-02-16 17:00:56-0800 [rxomega] DEBUG: Crawled (200)  (referer: None)
2014-02-16 17:00:56-0800 [rxomega] INFO: Closing spider (finished)
2014-02-16 17:00:56-0800 [rxomega] INFO: Dumping Scrapy stats:
    {'downloader/request_bytes': 588,
     'downloader/request_count': 2,
     'downloader/request_method_count/GET': 2,
     'downloader/response_bytes': 37790,
     'downloader/response_count': 2,
     'downloader/response_status_count/200': 2,
     'finish_reason': 'finished',
     'finish_time': datetime.datetime(2014, 2, 17, 1, 0, 56, 22065),
     'log_count/DEBUG': 4,
     'log_count/INFO': 7,
     'response_received_count': 2,
     'scheduler/dequeued': 2,
     'scheduler/dequeued/memory': 2,
     'scheduler/enqueued': 2,
     'scheduler/enqueued/memory': 2,
     'start_time': datetime.datetime(2014, 2, 17, 1, 0, 55, 256404)}
2014-02-16 17:00:56-0800 [rxomega] INFO: Spider closed (finished)

câu trả lời hay nhất

genspider 特性创建了一个 CrawlSpider 和 parse_item，但是教程使用了 Spider 和 parse。两者都是 0.22 版本。更改为 Spider 并解析上面的代码，它就可以工作了。

关于python - Scrapy:已抓取 0 页(可在 scrapy shell 中使用，但不适用于 scrapy crawl spider 命令)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/21819055/