踩过的坑
不管是idea中直接引入还是 pip3 install pymysql 都会报错：ERROR: Could not find a version that satisfies the requirement pymysql (from versions: none)
原因是 网络问题，需要需要使用国内镜像源来加速，比如豆瓣源
pip install pymysql -i http://pypi.douban.com/simple/ --trusted-host pypi.douban.com
解决问题参考：https://blog.csdn.net/T_Y_F_/article/details/126225407，感谢博主分享
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