pip安装三方库不成功，提示：You are using pip version 19.0.3, however version 21.3.1 is available. You should ...

pip安装三方库不成功，提示：You are using pip version 19.0.3, however version 21.3.1 is available. You should consider upgrading via the 'python -m pip install --upgrade pip' command.

原因：pip版本过低导致安装第三方库失败

解决方案：更新pip版本

1、cmd打开命令窗口

2、输入命令：easy_install -U pip（如下图）

3、检查一下新版本是否安装成功，输入命令：pip list