python - Scrapy 教程(菜鸟)- 抓取了 0 页

Question

我一直在尝试遵循 Scrapy 教程(如，非常非常开始)，在项目顶层(即 scrapy.cfg 的级别)运行命令后，我得到以下输出:

 mikey@ubuntu:~/scrapy/tutorial$ scrapy crawl dmoz
/usr/lib/pymodules/python2.7/scrapy/settings/deprecated.py:26: ScrapyDeprecationWarning: You are using the following settings which are deprecated or obsolete (ask scrapy-users@googlegroups.com for alternatives):
    BOT_VERSION: no longer used (user agent defaults to Scrapy now)
  warnings.warn(msg, ScrapyDeprecationWarning)
2014-01-26 04:17:06-0800 [scrapy] INFO: Scrapy 0.22.0 started (bot: tutorial)
2014-01-26 04:17:06-0800 [scrapy] INFO: Optional features available: ssl, http11, boto, django
2014-01-26 04:17:06-0800 [scrapy] INFO: Overridden settings: {'DEFAULT_ITEM_CLASS': 'tutorial.items.TutorialItem', 'NEWSPIDER_MODULE': 'tutorial.spiders', 'SPIDER_MODULES': ['tutorial.spiders'], 'USER_AGENT': 'tutorial/1.0', 'BOT_NAME': 'tutorial'}
2014-01-26 04:17:06-0800 [scrapy] INFO: Enabled extensions: LogStats, TelnetConsole, CloseSpider, WebService, CoreStats, SpiderState
2014-01-26 04:17:06-0800 [scrapy] INFO: Enabled downloader middlewares: HttpAuthMiddleware, DownloadTimeoutMiddleware, UserAgentMiddleware, RetryMiddleware, DefaultHeadersMiddleware, MetaRefreshMiddleware, HttpCompressionMiddleware, RedirectMiddleware, CookiesMiddleware, ChunkedTransferMiddleware, DownloaderStats
2014-01-26 04:17:06-0800 [scrapy] INFO: Enabled spider middlewares: HttpErrorMiddleware, OffsiteMiddleware, RefererMiddleware, UrlLengthMiddleware, DepthMiddleware
2014-01-26 04:17:06-0800 [scrapy] INFO: Enabled item pipelines: 
2014-01-26 04:17:06-0800 [dmoz] INFO: Spider opened
2014-01-26 04:17:06-0800 [dmoz] INFO: Crawled 0 pages (at 0 pages/min), scraped 0 items (at 0 items/min)
2014-01-26 04:17:06-0800 [scrapy] DEBUG: Telnet console listening on 0.0.0.0:6023
2014-01-26 04:17:06-0800 [scrapy] DEBUG: Web service listening on 0.0.0.0:6080
2014-01-26 04:17:06-0800 [dmoz] DEBUG: Crawled (200) <GET http://www.dmoz.org/Computers/Programming/Languages/Python/Resources/> (referer: None)
2014-01-26 04:17:07-0800 [dmoz] DEBUG: Crawled (200) <GET http://www.dmoz.org/Computers/Programming/Languages/Python/Books/> (referer: None)
2014-01-26 04:17:07-0800 [dmoz] INFO: Closing spider (finished)
2014-01-26 04:17:07-0800 [dmoz] INFO: Dumping Scrapy stats:
    {'downloader/request_bytes': 472,
     'downloader/request_count': 2,
     'downloader/request_method_count/GET': 2,
     'downloader/response_bytes': 14888,
     'downloader/response_count': 2,
     'downloader/response_status_count/200': 2,
     'finish_reason': 'finished',
     'finish_time': datetime.datetime(2014, 1, 26, 12, 17, 7, 63261),
     '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, 1, 26, 12, 17, 6, 567929)}
2014-01-26 04:17:07-0800 [dmoz] INFO: Spider closed (finished)
mikey@ubuntu:~/scrapy/tutorial$ 

(即以 0/秒的速度抓取 0 个页面!!!!!!!!!!!!!!)

到目前为止的故障排除:1)检查 items.py 和 dmoz_spider.py 的语法(复制和粘贴以及手写)2)在线检查问题但看不到其他人有类似问题3)检查文件夹结构等确保从正确的位置运行命令4)升级到scrapy最新版本

有什么建议吗？我的代码与示例中完全相同

dmoz_spider.py是......

from scrapy.spider import Spider

class DmozSpider(Spider):
    name = "dmoz"
    allowed_domains = ["dmoz.org"]
    start_urls = [
        "http://www.dmoz.org/Computers/Programming/Languages/Python/Books/",
        "http://www.dmoz.org/Computers/Programming/Languages/Python/Resources/"
    ]

    def parse(self, response):
        filename = response.url.split("/")[-2]
        open(filename, 'wb').write(response.body)

还有items.py......

from scrapy.item import Item, Field

class DmozItem(Item):
    title = Field()
    link = Field()
    desc = Field()

Answer 1

首先您应该找出您想要抓取的内容。

您将两个起始网址传递给 scrapy，因此它抓取了它们，但无法找到更多要跟踪的网址。

该页面上的所有图书链接都不符合 allowed_domains dmoz.org。

您可以执行yield Request([next url])来抓取更多链接，next url可以从响应中解析。

或者继承CrawlSpider并指定类似this example的规则.