pip报错：WARNING: You are using pip version 21.2.4； however, version 21.3.1 is available.

问题：使用pip安装第三方模块报错，错误如下

WARNING: You are using pip version 21.2.4; however, version 21.3.1 is available.
You should consider upgrading via the 'C:\Program Files\Python39\python.exe -m pip install --upgrade pip' command.

如图所示：

WARNING: You are using pip version 21.2.4; however, version 21.3.1 is available.

这个警告就是提示你问题是什么，比如我的问题就是版本低了，要升级到21.3.1。

You should consider upgrading via the 'C:\Program Files\Python39\python.exe -m pip install --upgrade pip' command.

这行就是告诉你解决方法，通过 python -m pip install --upgrade pip 这个命令升级。

技巧：

可以通过 pip --version 来查看当前的版本