Scrapy教程例外

Question

我正在http://media.readthedocs.org/pdf/scrapy/0.14/scrapy.pdf上关注Scrapy教程文档,我已经验证了items.py和dmoz_spider.py是否正确输入(未剪切和粘贴) .

对我来说第一个"嗯......"部分就是这个指令:

这是我们第一个蜘蛛的代码; 将其保存在dmoz/spiders目录下名为dmoz_spider.py的文件中

我正在使用最新版本的Ubuntu并且没有创建dmoz文件夹,因此我将此代码放入〜/ tutorial/tutorial/spiders中.(这是我的第一个错误吗？)

所以这是我的dmoz_spider.py脚本:

from scrapy.spider import BaseSpider

class DmozSpider(BaseSpider):
   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)

在我的终端我输入

scrapy crawl dmoz

我得到了这个:

2012-10-08 13:20:22-0700 [scrapy] INFO: Scrapy 0.12.0.2546 started (bot: tutorial)
2012-10-08 13:20:22-0700 [scrapy] DEBUG: Enabled extensions: TelnetConsole, SpiderContext, WebService, CoreStats, MemoryUsage, CloseSpider
2012-10-08 13:20:22-0700 [scrapy] DEBUG: Enabled scheduler middlewares: DuplicatesFilterMiddleware
2012-10-08 13:20:22-0700 [scrapy] DEBUG: Enabled downloader middlewares: HttpAuthMiddleware, DownloadTimeoutMiddleware, UserAgentMiddleware, RetryMiddleware, DefaultHeadersMiddleware, RedirectMiddleware, CookiesMiddleware, HttpCompressionMiddleware, DownloaderStats
2012-10-08 13:20:22-0700 [scrapy] DEBUG: Enabled spider middlewares: HttpErrorMiddleware, OffsiteMiddleware, RefererMiddleware, UrlLengthMiddleware, DepthMiddleware
2012-10-08 13:20:22-0700 [scrapy] DEBUG: Enabled item pipelines: 
2012-10-08 13:20:22-0700 [scrapy] DEBUG: Telnet console listening on 0.0.0.0:6023
2012-10-08 13:20:22-0700 [scrapy] DEBUG: Web service listening on 0.0.0.0:6080
2012-10-08 13:20:22-0700 [dmoz] INFO: Spider opened
2012-10-08 13:20:22-0700 [dmoz] DEBUG: Crawled (200) <GET http://www.dmoz.org/Computers/Programming/Languages/Python/Resources/> (referer: None)
2012-10-08 13:20:22-0700 [dmoz] ERROR: Spider error processing <http://www.dmoz.org/Computers/Programming/Languages/Python/Resources/> (referer: <None>)
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/twisted/internet/base.py", line 1178, in mainLoop
    self.runUntilCurrent()
  File "/usr/lib/python2.7/dist-packages/twisted/internet/base.py", line 800, in runUntilCurrent
    call.func(*call.args, **call.kw)
  File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 362, in callback
    self._startRunCallbacks(result)
  File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 458, in _startRunCallbacks
    self._runCallbacks()
--- <exception caught here> ---
  File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 545, in _runCallbacks
    current.result = callback(current.result, *args, **kw)
  File "/usr/lib/python2.7/dist-packages/scrapy/spider.py", line 62, in parse
    raise NotImplementedError
exceptions.NotImplementedError: 

2012-10-08 13:20:22-0700 [dmoz] DEBUG: Crawled (200) <GET http://www.dmoz.org/Computers/Programming/Languages/Python/Books/> (referer: None)
2012-10-08 13:20:22-0700 [dmoz] ERROR: Spider error processing <http://www.dmoz.org/Computers/Programming/Languages/Python/Books/> (referer: <None>)
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/twisted/internet/base.py", line 1178, in mainLoop
    self.runUntilCurrent()
  File "/usr/lib/python2.7/dist-packages/twisted/internet/base.py", line 800, in runUntilCurrent
    call.func(*call.args, **call.kw)
  File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 362, in callback
    self._startRunCallbacks(result)
  File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 458, in _startRunCallbacks
    self._runCallbacks()
--- <exception caught here> ---
  File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 545, in _runCallbacks
    current.result = callback(current.result, *args, **kw)
  File "/usr/lib/python2.7/dist-packages/scrapy/spider.py", line 62, in parse
    raise NotImplementedError
exceptions.NotImplementedError: 

2012-10-08 13:20:22-0700 [dmoz] INFO: Closing spider (finished)
2012-10-08 13:20:22-0700 [dmoz] INFO: Spider closed (finished)

在我的搜索中,我看到其他人说过扭曲可能没有安装......但如果我使用Scrapy的Ubuntu软件包安装程序会不会安装它？

提前致谢!

Answer 1

由于您没有正确覆盖解析方法,因此调用BaseSpider中的parse方法而不是您的方法.您的缩进是错误的,因此解析被声明为DmozSpider类之外的函数.欢迎来到python :)

它与扭曲无关,我可以看到扭曲在追溯中,所以它已经清楚地安装了.