Scrapy报错'float' object is not iterable解决方法_scrapy 'float' object is not iterable

ypeError: 'float' object is not iterable
2018-02-02 10:13:50 [scrapy] ERROR: Error downloading <GET http://quotes.toscrape.com/page/2/>
TypeError: 'float' object is not iterable

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/mwl/anaconda3/lib/python3.5/site-packages/twisted/internet/defer.py", line 1299, in _inlineCallbacks
    result = result.throwExceptionIntoGenerator(g)
  File "/home/mwl/anaconda3/lib/python3.5/site-packages/twisted/python/failure.py", line 393, in throwExceptionIntoGenerator
    return g.throw(self.type, self.value, self.tb)
  File "/home/mwl/anaconda3/lib/python3.5/site-packages/scrapy/core/downloader/middleware.py", line 43, in process_request
    defer.returnValue((yield download_func(request=request,spider=spider)))
  File "/home/mwl/anaconda3/lib/python3.5/site-packages/scrapy/utils/defer.py", line 45, in mustbe_deferred
    result = f(*args, **kw)
  File "/home/mwl/anaconda3/lib/python3.5/site-packages/scrapy/core/downloader/handlers/__init__.py", line 65, in download_request
    return handler.download_request(request, spider)
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搜索发现是Twisted库的版本问题，我使用的是conda安装的默认Twisted的版本是17.1.0需要降级到16.6.0，使用命令conda install Twisted==16.6.0。
参考这个。