@property
    def async(self):

        if self._mode is _WRITER:
            raise TypeError("Setting async on a WRITER makes no sense")
        return self._clone(mode=_ASYNC_READER)
Modifier to set a READER operation to ASYNC_READER.
dataset/ETHPy150Open openstack/oslo.db/oslo_db/sqlalchemy/enginefacade.py/_TransactionContextManager.async