sqlalchemy.exc.ResourceClosedError错误
用python的ORM——sqlalchemy 经常出现 'sqlalchemy.exc.ResourceClosedError' 错误，估计是跟数据库连接有关，但不确定具体的原因，还在找寻中 ...
<class 'sqlalchemy.exc.ResourceClosedError'>: The transaction is closed
args = ('The transaction is closed',)
message = 'The transaction is closed'
python 新手 ， 请多关照
