def __getattr__(self, key):
        try:
            return getattr(self.comparator, key)
        except __HOLE__:
            raise AttributeError(
                'Neither %r object nor %r object associated with %s '
                'has an attribute %r' % (
                    type(self).__name__,
                    type(self.comparator).__name__,
                    self,
                    key)
            )
dataset/ETHPy150Open RoseOu/flasky/venv/lib/python2.7/site-packages/sqlalchemy/orm/attributes.py/QueryableAttribute.__getattr__