升级pip

报错提示：
WARNING: You are using pip version 19.1.1, however version 20.0.2 is available.
You should consider upgrading via the ‘python -m pip install --upgrade pip’ command.

解决办法

py -m pip install --upgrade pip

记得关掉梯子
如果安装之后还提示不行的话，可能是下载到了其他位置，粘贴到当前虚拟环境中就行了