报错:(1193, "Unknown system variable 'tx_isolation'")
pipinstall-ihttps://pypi.tuna.tsinghua.edu.cn/simple--upgradesqlalchemy--ignore-installed这个安装以后会报错提示如下WARNING:Youareusingpipversion19.3.1;however,version20.0.2isavailable.Youshouldconsiderupgradingvia