sqlalchemy.orm.exc.DetachedInstanceError: Instance ＜ at 0x24575b0b970＞ is not bound to a Sess

sqlalchemy.orm.exc.DetachedInstanceError: Instance <Article at 0x24575b0b970> is not bound to a Session; attribute refresh operation cannot proceed

 解决办法：在session关闭之前将对象擦除。