Django2.2之后，pymysql不能用了，需要安装mysqlclient

ubuntu18 安装mysqlclient报错OSError: mysql_config not found，缺少依赖导致

sudo apt-get install libmysqlclient-dev
sudo apt install libssl-dev 
sudo apt install libcrypto++-dev
pip3 install mysqlclient

ubuntu18 安装mysqlclient报错Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-8139q6vm/mysqlclient/