pythonフレームワーク Scrapyエラー TypeError: 'float' object is not iterable Solve

最近、pythonのクローラーフレームワークScrapyを使ってWebサイトのクローリングの練習をしていたのですが、クローリング時に必ず以下のエラーが出て実行が失敗してしまいます。

2017-03-09 13:58:34 [scrapy] INFO: Enabled item pipelines:
[]
2017-03-09 13:58:34 [scrapy] INFO: Spider opened
2017-03-09 13:58:34 [scrapy] INFO: Crawled 0 pages (at 0 pages/min), scraped 0 items (at 0 items/min)
2017-03-09 13:58:34 [scrapy] DEBUG: Telnet console listening on 127.0.0.1:6023
2017-03-09 13:58:34 [scrapy] ERROR: Error downloading <GET http://www.23us.com/robots.txt>: 'float' object is not iterable
Traceback (most recent call last):
  File "D:\greenSoftware\anaconda3-python\lib\site-packages\twisted\internet\defer.py", line 1299, in _inlineCallbacks
    result = result.throwExceptionIntoGenerator(g)
  File "D:\greenSoftware\anaconda3-python\lib\site-packages\twisted\python\failure.py", line 393, in throwExceptionIntoGenerator
    return g.throw(self.type, self.value, self.tb)
  File "D:\greenSoftware\anaconda3-python\lib\site-packages\scrapy\core\downloader\middleware", line 43, in process_request
    defer.returnValue((yield download_func(request=request,spider=spider)))
  File "D:\greenSoftware\anaconda3-python\lib\site-packages\scrapy\utils\defer.py", line 45, in mustbe_deferred
    result = f(*args, **kw)
  File "D:\greenSoftware\anaconda3-python-\lib\site-packages\scrapy\core\downloader\handlers\__init__.py", line 65, in download_ request
    return handler.download_request(request, spider)
  File "D:\greenSoftware\anaconda3-python\lib\site-packages\scrapy\core\downloader\handlers\http11.py", line 60, in download_ request request
    return agent.download_request(request)
  File "D:\greenSoftware\anaconda3-python-\lib\site-packages\scrapy\core\downloader\handlers\http11.py", line 285, in download_ request request
    method, to_bytes(url, encoding='ascii'), headers, bodyproducer)
  File "D:\greenSoftware\anaconda3-python\lib\site-packages\twisted\web\client.py", line 1631, in request
    parsedURI.originForm)
  File "D:\greenSoftware\anaconda3-python-\lib\site-packages\twisted\web\client.py", line 1408, in _requestWithEndpoint
    d = self._pool.getConnection(key, endpoint)
  File "D:\greenSoftware\anaconda3-python\lib\site-packages\twisted\web\client.py", line 1294, in getConnection
    return self._newConnection(key, endpoint)
  File "D:\greenSoftware\anaconda3-python\lib\site-packages\twisted\web\client.py", line 1306, in _newConnection
    return endpoint.connect(factory)
  File "D:\greenSoftware\anaconda3-python-lib\site-packages\twisted\internet\endpoints.py", line 788, in connect
    EndpointReceiver, self._hostText, portNumber=self._port
  File "D:\greenSoftware\anaconda3-python\lib\site-packages\twisted\internet\_resolver.py", line 174, in resolveHostName
    onAddress = self._simpleResolver.getHostByName(hostName)
  File "D:\greenSoftware\anaconda3-python\lib\site-packages\scrapy\resolver.py", line 21, in getHostByName
    d = super(CachingThreadedResolver, self).getHostByName(name, timeout)
  File "D:\greenSoftware\anaconda3-python\lib\site-packages\twisted\internet\base.py", line 276, in getHostByName
    timeoutDelay = sum(timeout)
TypeError: 'float' object is not iterable
2017-03-09 13:58:34 [scrapy] ERROR: Error downloading <GET http://www.23us.com/class/1_1.html>
TypeError: 'float' object is not iterable

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "D:\greenSoftware\anaconda3-python\lib\site-packages\twisted\internet\defer.py", line 1299, in _inlineCallbacks
    result = result.throwExceptionIntoGenerator(g)
  File "D:\greenSoftware\anaconda3-python\lib\site-packages\twisted\python\failure.py", line 393, in throwExceptionIntoGenerator
    return g.throw(self.type, self.value, self.tb)
  File "D:\greenSoftware\anaconda3-python\lib\site-packages\scrapy\core\downloader\middleware", line 43, in process_request
    defer.returnValue((yield download_func(request=request,spider=spider)))
  File "D:\greenSoftware\anaconda3-python\lib\site-packages\scrapy\utils\defer.py", line 45, in mustbe_deferred
    result = f(*args, **kw)
  File "D:\greenSoftware\anaconda3-python-\lib\site-packages\scrapy\core\downloader\handlers\__init__.py", line 65, in download_ request
    return handler.download_request(request, spider)
  File "D:\greenSoftware\anaconda3-python\lib\site-packages\scrapy\core\downloader\handlers\http11.py", line 60, in download_ request request
    return agent.download_request(request)
  File "D:\greenSoftware\anaconda3-python-\lib\site-packages\scrapy\core\downloader\handlers\http11.py", line 285, in download_ request request
    method, to_bytes(url, encoding='ascii'), headers, bodyproducer)
  File "D:\greenSoftware\anaconda3-python\lib\site-packages\twisted\web\client.py", line 1631, in request
    parsedURI.originForm)
  File "D:\greenSoftware\anaconda3-python-\lib\site-packages\twisted\web\client.py", line 1408, in _requestWithEndpoint
    d = self._pool.getConnection(key, endpoint)
  File "D:\greenSoftware\anaconda3-python\lib\site-packages\twisted\web\client.py", line 1294, in getConnection
    return self._newConnection(key, endpoint)
  File "D:\greenSoftware\anaconda3-python\lib\site-packages\twisted\web\client.py", line 1306, in _newConnection
    return endpoint.connect(factory)
  File "D:\greenSoftware\anaconda3-python-lib\site-packages\twisted\internet\endpoints.py", line 788, in connect
    EndpointReceiver, self._hostText, portNumber=self._port
  File "D:\greenSoftware\anaconda3-python\lib\site-packages\twisted\internet\_resolver.py", line 174, in resolveHostName
    onAddress = self._simpleResolver.getHostByName(hostName)
  File "D:\greenSoftware\anaconda3-python\lib\site-packages\scrapy\resolver.py", line 21, in getHostByName
    d = super(CachingThreadedResolver, self).getHostByName(name, timeout)
  File "D:\greenSoftware\anaconda3-python\lib\site-packages\twisted\internet\base.py", line 276, in getHostByName
    timeoutDelay = sum(timeout)
TypeError: 'float' object is not iterable
2017-03-09 13:58:34

検索した結果、ローカルの Twisted ライブラリのバージョンの問題( これは ).

そして、ローカルで使っているのは anaconda python ディストリビューションは、Scrapy をインストールする際にデフォルトでインストールされます。 Twisted ライブラリは17.1.0です。 Twisted ライブラリを16.6.0に変更することで、( conda install Twisted==16.6.0 をインストールしてください)。