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问题描述：
pip安装库文件时报错：You are using pip version 10.0.1, however version 18.0 is available.
You should consider upgrading via the ‘python -m pip install –upgrade pip’ command. 
此时按照提示执行命令python -m pip install –upgrade pip
下载到最后报错Could not install packages due to an EnvironmentError: [WinError 5] 拒绝访问
解决办法：
更新指令中加上–user
python -m pip install –user –upgrade pip==18.0
最终查看是否更新完成
pip list 
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