运行scrapy shell [URL]，得到TypeError：
(scrapy) D:\>scrapy shell "www.python.com" 2017-03-08 12:12:05 [scrapy] INFO: Scrapy 1.1.1 started (bot: scrapybot) 2017-03-08 12:12:05 [scrapy] INFO: Overridden settings: {'DUPEFILTER_CLASS': 'scrapy.dupefilters.BaseDupeFilter', 'LOGSTATS_INTERVAL': 0} 2017-03-08 12:12:05 [scrapy] INFO: Enabled extensions: ['scrapy.extensions.corestats.CoreStats', 'scrapy.extensions.telnet.TelnetConsole'] 2017-03-08 12:12:05 [scrapy] INFO: Enabled downloader middlewares: ['scrapy.downloadermiddlewares.httpauth.HttpAuthMiddleware', 'scrapy.downloadermiddlewares.downloadtimeout.DownloadTimeoutMiddleware', 'scrapy.downloadermiddlewares.useragent.UserAgentMiddleware', 'scrapy.downloadermiddlewares.retry.RetryMiddleware', 'scrapy.downloadermiddlewares.defaultheaders.DefaultHeadersMiddleware', 'scrapy.downloadermiddlewares.redirect.MetaRefreshMiddleware', 'scrapy.downloadermiddlewares.httpcompression.HttpCompressionMiddleware', 'scrapy.downloadermiddlewares.redirect.RedirectMiddleware', 'scrapy.downloadermiddlewares.cookies.CookiesMiddleware', 'scrapy.downloadermiddlewares.chunked.ChunkedTransferMiddleware', 'scrapy.downloadermiddlewares.stats.DownloaderStats'] 2017-03-08 12:12:05 [scrapy] INFO: Enabled spider middlewares: ['scrapy.spidermiddlewares.httperror.HttpErrorMiddleware', 'scrapy.spidermiddlewares.offsite.OffsiteMiddleware', 'scrapy.spidermiddlewares.referer.RefererMiddleware', 'scrapy.spidermiddlewares.urllength.UrlLengthMiddleware', 'scrapy.spidermiddlewares.depth.DepthMiddleware'] 2017-03-08 12:12:05 [scrapy] INFO: Enabled item pipelines: [] 2017-03-08 12:12:05 [scrapy] DEBUG: Telnet console listening on 127.0.0.1:6023 2017-03-08 12:12:05 [scrapy] INFO: Spider opened Traceback (most recent call last): File "d:\Anaconda3\envs\scrapy\Scripts\scrapy-script.py", line 5, in <module> sys.exit(scrapy.cmdline.execute()) File "d:\Anaconda3\envs\scrapy\lib\site-packages\scrapy\cmdline.py", line 142, in execute _run_print_help(parser, _run_command, cmd, args, opts) File "d:\Anaconda3\envs\scrapy\lib\site-packages\scrapy\cmdline.py", line 88, in _run_print_help func(*a, **kw) File "d:\Anaconda3\envs\scrapy\lib\site-packages\scrapy\cmdline.py", line 149, in _run_command cmd.run(args, opts) File "d:\Anaconda3\envs\scrapy\lib\site-packages\scrapy\commands\shell.py", line 71, in run shell.start(url=url) File "d:\Anaconda3\envs\scrapy\lib\site-packages\scrapy\shell.py", line 47, in start self.fetch(url, spider) File "d:\Anaconda3\envs\scrapy\lib\site-packages\scrapy\shell.py", line 112, in fetch reactor, self._schedule, request, spider) File "d:\Anaconda3\envs\scrapy\lib\site-packages\twisted\internet\threads.py", line 122, in blockingCallFromThread result.raiseException() File "d:\Anaconda3\envs\scrapy\lib\site-packages\twisted\python\failure.py", line 372, in raiseException raise self.value.with_traceback(self.tb) TypeError: 'float' object is not iterable解决： 我在台式机上的虚拟环境为python3.6，scrapy1.1.1，同样可以运行，于是看了下返回的错误发生在twisted，检查了一下，台式机上是twisted16.6.0，然后应该是最近升级了一次，笔记本自动安装的是17.1.0的版本，然后执行
conda install twisted==16.6.0然后DOWNGRADE，yes，再次运行scrapy shell “www.python.org”，可以成功进入ipython。
最后查github上的issue list也发现了同样的问题。 scrapy/issues/2606
