mysql grants 学习 https://www.yiibai.com/mysql/grant.html
pycharm ： https://jetlicense.nss.im/ https://idea.qmanga.com
服务器time_wait多，参数调整
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_fin_timeout = 30