在python中下载任何URL时出错

我用谷歌链接运行了简单的scrapy spider，它提供了hello的搜索结果，但有一个错误

代码（蜘蛛代码）

错误是

2017-02-26 18:06:11 [scrapy] DEBUG: Telnet console listening on 127.0.0.1:6023
2017-02-26 18:06:11 [scrapy] ERROR: Error downloading <GET http://www.google.com/>
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/scrapy/utils/defer.py", line 45, in mustbe_deferred
    result = f(*args, **kw)
  File "/usr/lib/python2.7/dist-packages/scrapy/core/downloader/handlers/__init__.py", line 41, in download_request
    return handler(request, spider)
  File "/usr/lib/python2.7/dist-packages/scrapy/core/downloader/handlers/http11.py", line 44, in download_request
    return agent.download_request(request)
  File "/usr/lib/python2.7/dist-packages/scrapy/core/downloader/handlers/http11.py", line 211, in download_request
    d = agent.request(method, url, headers, bodyproducer)
  File "/usr/local/lib/python2.7/dist-packages/twisted/web/client.py", line 1631, in request
    parsedURI.originForm)
  File "/usr/local/lib/python2.7/dist-packages/twisted/web/client.py", line 1408, in _requestWithEndpoint
    d = self._pool.getConnection(key, endpoint)
  File "/usr/local/lib/python2.7/dist-packages/twisted/web/client.py", line 1294, in getConnection
    return self._newConnection(key, endpoint)
  File "/usr/local/lib/python2.7/dist-packages/twisted/web/client.py", line 1306, in _newConnection
    return endpoint.connect(factory)
  File "/usr/local/lib/python2.7/dist-packages/twisted/internet/endpoints.py", line 788, in connect
    EndpointReceiver, self._hostText, portNumber=self._port
  File "/usr/local/lib/python2.7/dist-packages/twisted/internet/_resolver.py", line 174, in resolveHostName
    onAddress = self._simpleResolver.getHostByName(hostName)
  File "/usr/lib/python2.7/dist-packages/scrapy/resolver.py", line 21, in getHostByName
    d = super(CachingThreadedResolver, self).getHostByName(name, timeout)
  File "/usr/local/lib/python2.7/dist-packages/twisted/internet/base.py", line 276, in getHostByName
    timeoutDelay = sum(timeout)
TypeError: 'float' object is not iterable
2017-02-26 18:06:11 [scrapy] INFO: Closing spider (finished)
2017-02-26 18:06:11 [scrapy] INFO: Dumping Scrapy stats:

2017-02-26 18:06:11[scrapy]调试：Telnet控制台监听127.0.0.1:6023
2017-02-26 18:06:11[scrapy]错误：下载错误
回溯（最近一次呼叫最后一次）：
文件“/usr/lib/python2.7/dist packages/scrapy/utils/defer.py”，第45行，必须延迟
结果=f（*参数，**kw）
下载请求中的第41行文件“/usr/lib/python2.7/dist packages/scrapy/core/downloader/handlers/_init__.py”
返回处理程序（请求，spider）
下载请求中的文件“/usr/lib/python2.7/dist packages/scrapy/core/downloader/handlers/http11.py”，第44行
返回代理。下载请求（请求）
下载请求中的文件“/usr/lib/python2.7/dist packages/scrapy/core/downloader/handlers/http11.py”，第211行
d=agent.request（方法、url、标题、bodyproducer）
请求中的文件“/usr/local/lib/python2.7/dist-packages/twisted/web/client.py”，第1631行
parsedURI.原件）
文件“/usr/local/lib/python2.7/dist packages/twisted/web/client.py”，第1408行，在_requestWithEndpoint中
d=self.\u pool.getConnection（键，端点）
文件“/usr/local/lib/python2.7/dist-packages/twisted/web/client.py”，第1294行，位于getConnection中
返回self.\u新连接（键，端点）
文件“/usr/local/lib/python2.7/dist-packages/twisted/web/client.py”，第1306行，在新连接中
返回端点.connect（工厂）
文件“/usr/local/lib/python2.7/dist-packages/twisted/internet/endpoints.py”，第788行，在connect中
EndpointReceiver，self.\u主机文本，端口号=self.\u端口
resolveHostName中的文件“/usr/local/lib/python2.7/dist packages/twisted/internet/_resolver.py”，第174行
onAddress=self.\u simpleResolver.getHostByName（主机名）
文件“/usr/lib/python2.7/dist packages/scrapy/resolver.py”，第21行，在getHostByName中
d=super（CachingThreadedResolver，self）.getHostByName（名称，超时）
文件“/usr/local/lib/python2.7/dist-packages/twisted/internet/base.py”，第276行，位于getHostByName中
timeoutDelay=总和（超时）
TypeError:“float”对象不可编辑
2017-02-26 18:06:11[scrapy]信息：关闭卡盘（已完成）
2017-02-26 18:06:11[scrapy]信息：倾销scrapy统计数据：

请帮我解决这个问题，我有ubuntu 16.10，我发现了这个问题。

---

twisted的版本太高了，您可以将其更改为16.6.0，并且工作成功

请包括完整的代码。我们无法运行您提供的代码并获得相同的结果。我使用

startproject链接创建了Scrapy项目

，还使用

genspider lins

创建了spider，而

lins.py

文件的代码是我在问题中编写的

2017-02-26 18:06:11 [scrapy] DEBUG: Telnet console listening on 127.0.0.1:6023
2017-02-26 18:06:11 [scrapy] ERROR: Error downloading <GET http://www.google.com/>
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/scrapy/utils/defer.py", line 45, in mustbe_deferred
    result = f(*args, **kw)
  File "/usr/lib/python2.7/dist-packages/scrapy/core/downloader/handlers/__init__.py", line 41, in download_request
    return handler(request, spider)
  File "/usr/lib/python2.7/dist-packages/scrapy/core/downloader/handlers/http11.py", line 44, in download_request
    return agent.download_request(request)
  File "/usr/lib/python2.7/dist-packages/scrapy/core/downloader/handlers/http11.py", line 211, in download_request
    d = agent.request(method, url, headers, bodyproducer)
  File "/usr/local/lib/python2.7/dist-packages/twisted/web/client.py", line 1631, in request
    parsedURI.originForm)
  File "/usr/local/lib/python2.7/dist-packages/twisted/web/client.py", line 1408, in _requestWithEndpoint
    d = self._pool.getConnection(key, endpoint)
  File "/usr/local/lib/python2.7/dist-packages/twisted/web/client.py", line 1294, in getConnection
    return self._newConnection(key, endpoint)
  File "/usr/local/lib/python2.7/dist-packages/twisted/web/client.py", line 1306, in _newConnection
    return endpoint.connect(factory)
  File "/usr/local/lib/python2.7/dist-packages/twisted/internet/endpoints.py", line 788, in connect
    EndpointReceiver, self._hostText, portNumber=self._port
  File "/usr/local/lib/python2.7/dist-packages/twisted/internet/_resolver.py", line 174, in resolveHostName
    onAddress = self._simpleResolver.getHostByName(hostName)
  File "/usr/lib/python2.7/dist-packages/scrapy/resolver.py", line 21, in getHostByName
    d = super(CachingThreadedResolver, self).getHostByName(name, timeout)
  File "/usr/local/lib/python2.7/dist-packages/twisted/internet/base.py", line 276, in getHostByName
    timeoutDelay = sum(timeout)
TypeError: 'float' object is not iterable
2017-02-26 18:06:11 [scrapy] INFO: Closing spider (finished)
2017-02-26 18:06:11 [scrapy] INFO: Dumping Scrapy stats: