pip安装包：pip install Packagename+包名
pip install Packagename
返回如下结果表示安装成功
Successfully installed Packagename
pip查看已安装的包
pip show --files Packagename
pip检查那些包有新的版本
pip list --outdated
pip升级包
pip install --upgrade Packagename
pip卸载包
pip uninstall Packagename
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