原因是没有配置pymysql

配置mysql连接https://blog.csdn.net/zzzcl112/article/details/80503690#:~:text=%5Broot%40VM_0_8_centos%20local%5D%20%23%20tar%20-zxvf%20PyMySQL-0.8.1.tar.gz%20%E8%BF%9B%E5%85%A5%2Fusr%2Flocal%2FPyMySQL-0.8.1%E7%9B%AE%E5%BD%95%2C%E6%89%A7%E8%A1%8C%EF%BC%9A%20%5Broot%40VM_,8%20_centos%20PyMySQL-%200.8.1%20%5D%23%20python%20setup.py%20install