Estoy siguiendo la documentación del tutorial de Scrapy al http://media.readthedocs.org/pdf/scrapy/0.14/scrapy.pdf y he verificado que items.py y dmoz_spider.py están escritos (no cortados & pegados) correctamente.Excepciones del tutorial de Scrapy
El primer "hmmm ..." para mí era esta instrucción:
Este es el código para nuestra primera araña; guardarlo en un archivo llamado dmoz_spider.py en el directorio dmoz/arañas
Estoy usando la última versión de Ubuntu y no había una carpeta dmoz creado, por lo que he puesto este código en ~/tutorial/tutorial/arañas. (¿Era esta mi primer error?)
Así que aquí está mi script dmoz_spider.py:
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)
En mi terminal de tipo I
scrapy crawl dmoz
y me sale esto:
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)
En mi búsqueda, vi que alguien más había dicho que twisted probablemente no estaba instalado ... pero ¿no lo instalaría si usara el Instalador de paquetes Ubuntu para Scrapy?
¡Gracias de antemano!
¿Por qué no comprobar primero si está realmente instalado? No confíes en tu conjetura :) – Alfabravo