Question

我正在尝试在我的项目的根目录中运行scrapy shell，但是我在某种DATABASE设置上遇到了一个模糊的错误。我不确定这是否是SQLAlchemy的事情......或者我的架构定义有问题吗？

如果我从项目路径之外的任何其他目录运行scrapy shell http://some_website.com，我没有问题。

尝试启动shell：

me@me:~/my_spider$ scrapy shell http://some_website.com
2015-12-13 15:15:58-0800 [scrapy] INFO: Scrapy 0.24.4 started (bot: my_bot)
2015-12-13 15:15:58-0800 [scrapy] INFO: Optional features available: ssl, http11, boto, django
2015-12-13 15:15:58-0800 [scrapy] INFO: Overridden settings: {'NEWSPIDER_MODULE': 'my_spider.spiders', 'DEPTH_LIMIT': 2, 'CONCURRENT_REQUESTS_PER_DOMAIN': 1, 'CONCURRENT_REQUESTS': 1, 'SPIDER_MODULES': [''my_spider.spiders'], 'BOT_NAME': 'my_bot', 'COOKIES_ENABLED': False, 'LOGSTATS_INTERVAL': 0, 'DOWNLOAD_DELAY': 5}
2015-12-13 15:15:58-0800 [scrapy] INFO: Enabled extensions: TelnetConsole, CloseSpider, WebService, CoreStats, SpiderState
2015-12-13 15:15:59-0800 [scrapy] INFO: Enabled downloader middlewares: HttpAuthMiddleware, DownloadTimeoutMiddleware, RandomUserAgentMiddleware, ProxyMiddleware, RetryMiddleware, DefaultHeadersMiddleware, MetaRefreshMiddleware, HttpCompressionMiddleware, RedirectMiddleware, ChunkedTransferMiddleware, DownloaderStats
2015-12-13 15:15:59-0800 [scrapy] INFO: Enabled spider middlewares: HttpErrorMiddleware, OffsiteMiddleware, RefererMiddleware, UrlLengthMiddleware, DepthMiddleware

这里是追溯：

Traceback (most recent call last):
  File "/usr/local/bin/scrapy", line 11, in <module>
    sys.exit(execute())
  File "/usr/local/lib/python2.7/dist-packages/scrapy/cmdline.py", line 143, in execute
    _run_print_help(parser, _run_command, cmd, args, opts)
  File "/usr/local/lib/python2.7/dist-packages/scrapy/cmdline.py", line 89, in _run_print_help
    func(*a, **kw)
  File "/usr/local/lib/python2.7/dist-packages/scrapy/cmdline.py", line 150, in _run_command
    cmd.run(args, opts)
  File "/usr/local/lib/python2.7/dist-packages/scrapy/commands/shell.py", line 46, in run
    self.crawler_process.start_crawling()
  File "/usr/local/lib/python2.7/dist-packages/scrapy/crawler.py", line 124, in start_crawling
    return self._start_crawler() is not None
  File "/usr/local/lib/python2.7/dist-packages/scrapy/crawler.py", line 139, in _start_crawler
    crawler.configure()
  File "/usr/local/lib/python2.7/dist-packages/scrapy/crawler.py", line 47, in configure
    self.engine = ExecutionEngine(self, self._spider_closed)
  File "/usr/local/lib/python2.7/dist-packages/scrapy/core/engine.py", line 65, in __init__
    self.scraper = Scraper(crawler)
  File "/usr/local/lib/python2.7/dist-packages/scrapy/core/scraper.py", line 66, in __init__
    self.itemproc = itemproc_cls.from_crawler(crawler)
  File "/usr/local/lib/python2.7/dist-packages/scrapy/middleware.py", line 50, in from_crawler
    return cls.from_settings(crawler.settings, crawler)
  File "/usr/local/lib/python2.7/dist-packages/scrapy/middleware.py", line 35, in from_settings
    mw = mwcls()
  File "~/my_spider/pipelines.py", line 14, in __init__
    engine = db_connect()
  File "~/my_spider/libs/database/__init__.py", line 14, in db_connect
    url = URL(**settings.DATABASE)
AttributeError: 'module' object has no attribute 'DATABASE'

非常感谢任何建议。

Answer 1

你有一个settings变量定义，scrapy正在寻找而不是它认为会找到（或需要）的定义。

它没有找到settings模块scrapy/middleware.py调用正在使用的from_settings()对象，而是找到您的设置对象并查看它以提供{{1} }属性。没有看到.DATABASE中的代码，TraceBack和最新Python 2.7 scrapy中的代码行：

my_bot

建议对您不想要的设置对象进行方法解析，或者在没有实现所需属性的情况下遵循提供26 @classmethod 27 def from_settings(cls, settings, crawler=None): 28 mwlist = cls._get_mwlist_from_settings(settings) 29 middlewares = [] 30 for clspath in mwlist: 31 try: 32 mwcls = load_object(clspath) 33 if crawler and hasattr(mwcls, 'from_crawler'): 34 mw = mwcls.from_crawler(crawler) 35 elif hasattr(mwcls, 'from_settings'): 36 mw = mwcls.from_settings(settings)的教程。

Answer 2

除了@tristan指出的内容之外，根据追溯 - 当您启动shell时，Scrapy会选择包含管道的项目设置，其中一个管道正在执行db_connect()功能，该功能使用settings.DATABASE设置：

url = URL(**settings.DATABASE)

确保您在项目设置中定义了DATABASE字典。

AttributeError：使用scrapy shell时，'module'对象没有属性'DATABASE'

2 个答案: