解决：pip install 由于目标计算机积极拒绝，无法连接
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在虚拟环境pip install时，一开始我以为只是第三包的问题，但是后面pip install都这样：
WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', NewConnectionError(' : Failed to establish a new connection: [WinError 10061] 由于目标计算机积极拒绝，无法连接。') 
找到了两篇文章：
都是讲代理出了问题，解决方法就是删除以下标注的变量：
因为百度出来的解决方案都是说代理问题，并且这个方法也是讲代理，所以就按照上面的方法来。实际上是可行的。
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