8

我正在关注http://media.readthedocs.org/pdf/scrapy/0.14/scrapy.pdf上的 Scrapy 教程文档，并且我已经验证了 items.py 和 dmoz_spider.py 的输入（不是剪切和粘贴）正确.

对我来说，第一个“嗯……”部分是这条指令：

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

我使用的是最新版本的 Ubuntu，并且没有创建 dmoz 文件夹，所以我将此代码放入 ~/tutorial/tutorial/spiders。（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

我明白了：

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，我看到其他人说可能没有安装 twisted ......但是如果我使用 Scrapy 的 Ubuntu 软件包安装程序，它不会被安装吗？

提前致谢！

4

1 回答 1

15

BaseSpider 中的 parse 方法被调用而不是您的方法，因为您没有正确覆盖 parse 方法。您的缩进是错误的，因此 parse 被声明为 DmozSpider 类之外的函数。欢迎来到蟒蛇 :)

和twisted无关，我可以看到twisted在tracebacks中，所以很明显是安装的。

于 2012-10-09T09:52:39.187 回答