Python3.7之pip 升级

使用Python3.7 的pip包管理工具安装插件时提示如下错误信息：

You are using pip version 8.1.1, however version 9.0.1 is available.
You should consider upgrading via the 'python -m pip install --upgrade pip' command.
           

pip 升级命令：

python -m pip install --upgrade pip
           

pip 升级截图: