我们经常在安装Python库时会遇到以下问题：

You are using pip version 19.0.1, however version 19.2.3 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.

这是一个警告，但不会报错，库依然还会安装成功。现在就来看看如何升级pip3吧

然而根据提示输入相应命令后却报错：

$ pip3 install pip3 Collecting pip3

Could not find a version that satisfies the requirement pip3 (from versions: ) No matching distribution found for pip3 You are using pip version 19.0.1, however version 19.2.3 is available. You should consider upgrading via the 'pip install --upgrade pip' command.

其实这不是正确的姿势！

正确的姿势1：

pip3 install --upgrade pip

正确的姿势2：

python3 -m pip install --upgrade pip

Fly——一直逐梦编程的小白