error: scrapy TypeError: 'float' object is not iterable

正常运行爬虫，在公司电脑上没问题，回到家自己电脑上就出现了下面的报错，百思不得解

Traceback (most recent call last):
  File "D:\.virtualenvs\spider\lib\site-packages\twisted\internet\defer.py", line 1384, in _inlineCallbacks
    result = result.throwExceptionIntoGenerator(g)
  File "D:\.virtualenvs\spider\lib\site-packages\twisted\python\failure.py", line 422, in throwExceptionIntoGenerator
    return g.throw(self.type, self.value, self.tb)
  File "D:\.virtualenvs\spider\lib\site-packages\scrapy\core\downloader\middleware.py", line 43, in process_request
    defer.returnValue((yield download_func(request=request,spider=spider)))
  File "D:\.virtualenvs\spider\lib\site-packages\scrapy\utils\defer.py", line 45, in mustbe_deferred
    result = f(*args, **kw)
  File "D:\.virtualenvs\spider\lib\site-packages\scrapy\core\downloader\handlers\__init__.py", line 65, in download_request
    return handler.download_request(request, spider)
  File "D:\.virtualenvs\spider\lib\site-packages\scrapy\core\downloader\handlers\http11.py", line 60, in download_request
    return agent.download_request(request)
  File "D:\.virtualenvs\spider\lib\site-packages\scrapy\core\downloader\handlers\http11.py", line 285, in download_request
    method, to_bytes(url, encoding='ascii'), headers, bodyproducer)
  File "D:\.virtualenvs\spider\lib\site-packages\twisted\web\client.py", line 1657, in request
    parsedURI.originForm)
  File "D:\.virtualenvs\spider\lib\site-packages\twisted\web\client.py", line 1435, in _requestWithEndpoint
    d = self._pool.getConnection(key, endpoint)
  File "D:\.virtualenvs\spider\lib\site-packages\twisted\web\client.py", line 1320, in getConnection
    return self._newConnection(key, endpoint)
  File "D:\.virtualenvs\spider\lib\site-packages\twisted\web\client.py", line 1332, in _newConnection
    return endpoint.connect(factory)
  File "D:\.virtualenvs\spider\lib\site-packages\twisted\internet\endpoints.py", line 924, in connect
    EndpointReceiver, self._hostText, portNumber=self._port
  File "D:\.virtualenvs\spider\lib\site-packages\twisted\internet\_resolver.py", line 189, in resolveHostName
    onAddress = self._simpleResolver.getHostByName(hostName)
  File "D:\.virtualenvs\spider\lib\site-packages\scrapy\resolver.py", line 21, in getHostByName
    d = super(CachingThreadedResolver, self).getHostByName(name, timeout)
  File "D:\.virtualenvs\spider\lib\site-packages\twisted\internet\base.py", line 276, in getHostByName
    timeoutDelay = sum(timeout)
TypeError: 'float' object is not iterable
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网上查到是scrapy与twisted版本不兼容的问题
当前版本：

Scrapy==1.1.2
Twisted==18.4.0
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卸载twisted重装

pip uninstall twisted

pip install twisted==16.6.0
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参考

1. scrapy domz报错TypeError: ‘float’ object is not iterable
2. Scapry does not work with Twisted version 17.1.0