def as_scalar(self):
        try:
            return self.element.as_scalar()
        except __HOLE__:
            raise AttributeError("Element %s does not support "
                                 "'as_scalar()'" % self.element)
dataset/ETHPy150Open RoseOu/flasky/venv/lib/python2.7/site-packages/sqlalchemy/sql/selectable.py/Alias.as_scalar