关于mysqlclient

mysqlclient 换成下面：

pip3 install mysqlclient==1.4.2.post1  -i https://pypi.tuna.tsinghua.edu.cn/simple/


如果还不行，就到 https://pypi.org/project/mysqlclient/#files 网站下载
然后安装
pip install mysqlclient-2.2.4-cp39-cp39-win_amd64.whl