请问pymdql链接数据库出错是什么情况

C:\Users\Administrator>pip install PyMySQL
Requirement already satisfied: PyMySQL in d:\python\python39\lib\site-packages (1.0.2)
WARNING: You are using pip version 21.1.1; however, version 21.2.1 is available.
You should consider upgrading via the 'd:\python\python39\python.exe -m pip install --upgrade pip' command.

C:\Users\Administrator>

报错说的很明显，你的pip工具版本过低。需要更新为高版本。按照下面参考修改。

下载的3.9不合适，以安装好了换成3.7