AttributeError：__enter__ 使用 with 语句 SqlAlchemy 会话

我明白了AttributeError: __enter__当我尝试像这样使用 SQLAlchemy 会话时guide http://docs.sqlalchemy.org/en/latest/orm/session_basics.html.

My code:

Session = scoped_session(sessionmaker(autoflush=True, autocommit=False, bind=engine))
    
@contextmanager
def session_scope():
    session = Session()
    try:
        yield session
        session.commit()
    except:
        session.rollback()
        raise
    finally:
        session.close()

class SomeClass:

    def __init__(self):
        self.session_scope = session_scope

    def something_with_session(self):

        with self.session_scope as session:  # <-- error

我究竟做错了什么？我正在使用Python 3.6

您必须调用该函数来获取上下文

with self.session_scope() as session:
    ...