【发布时间】：2013-02-19 14:34:35
【问题描述】：
让我的 Scrapy 蜘蛛运行它的回调方法时遇到问题。
我不认为这是一个缩进错误，这似乎是其他先前帖子的情况，但也许是这样，我不知道吗？有什么想法吗？
from scrapy.contrib.spiders import CrawlSpider, Rule
from scrapy.contrib.linkextractors.sgml import SgmlLinkExtractor
from scrapy.selector import HtmlXPathSelector
from scrapy import log
import tldextract
class CrawlerSpider(CrawlSpider):
name = "crawler"
def __init__(self, initial_url):
log.msg('initing...', level=log.WARNING)
CrawlSpider.__init__(self)
if not initial_url.startswith('http'):
initial_url = 'http://' + initial_url
ext = tldextract.extract(initial_url)
initial_domain = ext.domain + '.' + ext.tld
initial_subdomain = ext.subdomain + '.' + ext.domain + '.' + ext.tld
self.allowed_domains = [initial_domain, 'www.' + initial_domain, initial_subdomain]
self.start_urls = [initial_url]
self.rules = [
Rule(SgmlLinkExtractor(), callback='parse_item'),
Rule(SgmlLinkExtractor(allow_domains=self.allowed_domains), follow=True),
]
self._compile_rules()
def parse_item(self, response):
log.msg('parse_item...', level=log.WARNING)
hxs = HtmlXPathSelector(response)
links = hxs.select("//a/@href").extract()
for link in links:
log.msg('link', level=log.WARNING)
示例输出如下；它应该显示一条带有“parse_item...”的警告消息，但它没有。
$ scrapy crawl crawler -a initial_url=http://www.szuhanchang.com/test.html
2013-02-19 18:03:24+0000 [scrapy] INFO: Scrapy 0.16.4 started (bot: crawler)
2013-02-19 18:03:24+0000 [scrapy] DEBUG: Enabled extensions: LogStats, TelnetConsole, CloseSpider, WebService, CoreStats, SpiderState
2013-02-19 18:03:24+0000 [scrapy] DEBUG: Enabled downloader middlewares: HttpAuthMiddleware, DownloadTimeoutMiddleware, UserAgentMiddleware, RetryMiddleware, DefaultHeadersMiddleware, RedirectMiddleware, CookiesMiddleware, HttpCompressionMiddleware, ChunkedTransferMiddleware, DownloaderStats
2013-02-19 18:03:24+0000 [scrapy] DEBUG: Enabled spider middlewares: HttpErrorMiddleware, OffsiteMiddleware, RefererMiddleware, UrlLengthMiddleware, DepthMiddleware
2013-02-19 18:03:24+0000 [scrapy] DEBUG: Enabled item pipelines:
2013-02-19 18:03:24+0000 [scrapy] WARNING: initing...
2013-02-19 18:03:24+0000 [crawler] INFO: Spider opened
2013-02-19 18:03:24+0000 [crawler] INFO: Crawled 0 pages (at 0 pages/min), scraped 0 items (at 0 items/min)
2013-02-19 18:03:24+0000 [scrapy] DEBUG: Telnet console listening on 0.0.0.0:6023
2013-02-19 18:03:24+0000 [scrapy] DEBUG: Web service listening on 0.0.0.0:6080
2013-02-19 18:03:25+0000 [crawler] DEBUG: Crawled (200) <GET http://www.szuhanchang.com/test.html> (referer: None)
2013-02-19 18:03:25+0000 [crawler] DEBUG: Filtered offsite request to 'www.20130219-0606.com': <GET http://www.20130219-0606.com/>
2013-02-19 18:03:25+0000 [crawler] INFO: Closing spider (finished)
2013-02-19 18:03:25+0000 [crawler] INFO: Dumping Scrapy stats:
{'downloader/request_bytes': 234,
'downloader/request_count': 1,
'downloader/request_method_count/GET': 1,
'downloader/response_bytes': 363,
'downloader/response_count': 1,
'downloader/response_status_count/200': 1,
'finish_reason': 'finished',
'finish_time': datetime.datetime(2013, 2, 19, 18, 3, 25, 84855),
'log_count/DEBUG': 8,
'log_count/INFO': 4,
'log_count/WARNING': 1,
'request_depth_max': 1,
'response_received_count': 1,
'scheduler/dequeued': 1,
'scheduler/dequeued/memory': 1,
'scheduler/enqueued': 1,
'scheduler/enqueued/memory': 1,
'start_time': datetime.datetime(2013, 2, 19, 18, 3, 24, 805064)}
2013-02-19 18:03:25+0000 [crawler] INFO: Spider closed (finished)
提前致谢！
【问题讨论】：
-
你是如何运行这个蜘蛛的？从命令行使用
scrapy crawl crawler? -
通过sidekiq（排队）工作人员，但我也在命令行上尝试过，但没有运气。为了更清楚起见，我已更改问题以包含命令行输出。
-
请提供一个简短的、独立的示例 (sscce.org)。如果我将此代码粘贴到一个新的蜘蛛中，它将无法工作，而且我必须安装 tldextract 模块，这使得测试有点棘手。
标签： python scrapy web-crawler