sqlAlchemy映射器未定义

Question

我收到以下错误消息：

Traceback (most recent call last):
File "alchemyTest.py", line 12, in <module>
planetMapper = mapper(Planet, planet)
NameError: name 'mapper' is not defined

我的SQLAlchemy版本是1.0.12。我使用以下代码：

connection = db.connect();
metadata = MetaData(db);

class Planet(object):
    pass

planet = Table('PLANET', metadata, autoload=True)
planetMapper = mapper(Planet, planet)

我在线搜索过，无法在mapper上找到任何未定义的内容。任何帮助表示赞赏。

Answer 1

from sqlalchemy.orm import mapper