TypeError: 'NoneType' object is not iterable

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本文记录了在实践Scrapy官方教程示例时遇到的一个错误，并分享了解决方案。错误发生在启动爬虫时，通过移除代码中的一个逗号解决了问题。

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今天在验证scrapy官网tutorial的例子时遇到了这个报错，例子的链接如下：

https://docs.scrapy.org/en/latest/intro/tutorial.html

example代码如下，去掉图中箭头处的‘，’（逗号），该问题得到解决，不知道是官网例子的代码有问题，还是我的编译环境和官网使用的不同导致

执行命令：

scrapy crawl quotes

错误日志：

2017-09-09 22:55:17 [scrapy.utils.log] INFO: Scrapy 1.4.0 started (bot: tutorial)

2017-09-09 22:55:17 [scrapy.utils.log] INFO: Overridden settings: {'BOT_NAME': 't
utorial', 'SPIDER_MODULES': ['tutorial.spiders'], 'NEWSPIDER_MODULE': 'tutorial.s
piders', 'ROBOTSTXT_OBEY': True}
2017-09-09 22:55:17 [scrapy.middleware] INFO: Enabled extensions:
['scrapy.extensions.corestats.CoreStats',
'scrapy.extensions.telnet.TelnetConsole',
'scrapy.extensions.logstats.LogStats']
2017-09-09 22:55:17 [scrapy.middleware] INFO: Enabled downloader middlewares:
['scrapy.downloadermiddlewares.robotstxt.RobotsTxtMiddleware',
'scrapy.downloadermiddlewares.httpauth.HttpAuthMiddleware',
'scrapy.downloadermiddlewares.downloadtimeout.DownloadTimeoutMiddleware',
'scrapy.downloadermiddlewares.defaultheaders.DefaultHeadersMiddleware',
'scrapy.downloadermiddlewares.useragent.UserAgentMiddleware',
'scrapy.downloadermiddlewares.retry.RetryMiddleware',
'scrapy.downloadermiddlewares.redirect.MetaRefreshMiddleware',
'scrapy.downloadermiddlewares.httpcompression.HttpCompressionMiddleware',
'scrapy.downloadermiddlewares.redirect.RedirectMiddleware',
'scrapy.downloadermiddlewares.cookies.CookiesMiddleware',
'scrapy.downloadermiddlewares.httpproxy.HttpProxyMiddleware',
'scrapy.downloadermiddlewares.stats.DownloaderStats']
2017-09-09 22:55:18 [scrapy.middleware] INFO: Enabled spider middlewares:
['scrapy.spidermiddlewares.httperror.HttpErrorMiddleware',
'scrapy.spidermiddlewares.offsite.OffsiteMiddleware',
'scrapy.spidermiddlewares.referer.RefererMiddleware',
'scrapy.spidermiddlewares.urllength.UrlLengthMiddleware',
'scrapy.spidermiddlewares.depth.DepthMiddleware']
2017-09-09 22:55:18 [scrapy.middleware] INFO: Enabled item pipelines:
[]
Unhandled error in Deferred:
2017-09-09 22:55:18 [twisted] CRITICAL: Unhandled error in Deferred:

2017-09-09 22:55:18 [twisted] CRITICAL:
Traceback (most recent call last):
File "e:\develop\python\lib\site-packages\twisted\internet\defer.py", line 1386
, in _inlineCallbacks
result = g.send(result)
File "e:\develop\python\lib\site-packages\scrapy\crawler.py", line 78, in crawl

start_requests = iter(self.spider.start_requests())
TypeError: 'NoneType' object is not iterable