setattr(obj, attr, value) is a built-in Python function that sets the value of a given attribute (attr) of an object (obj) to the specified value. getattr(obj, attr, default) is a built-in Python f..

MySQL 为日期增加一个时间间隔：date_add() now() //now函数为获取当前时间 select date_add(now(), interval 1 day); - 加1天 select date_add(now(), interval 1 hour); -加1小时 select date_add(n..