class Node(Repr, Base):
    __tablename__        = 'confignode'

    name                 = Column(String, name = 'node', primary_key = True)
    last_report_time     = Column(DateTime)

            # Works
            for row in db.query(Node, sqlalchemy.literal_column("2 + 2").label("foo")):
                print row

            # Doesn't work
            for row in db.query(Node, sqlalchemy.literal_column("2 + 2")):
                print row