python pip安装错误 ConnectTimeoutError错误解决办法

python pip安装错误 ConnectTimeoutError错误详情：（注：pycharm里面安装第三库也会出现这样的错误）python ……（此处略去n个字）阿里云 During handling of the above exception, another exception occurred:url ……（此处略去n个字）spa pip._vendor.requests.packa

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