def fetchone(self):
        try:
            row = self._fetchone_impl()
            if row is not None:
                return self.process_rows([row])[0]
            else:
                self.close()
                return None
        except Exception as e:
            self.connection._handle_dbapi_exception(
                e, None, None,
                self.cursor, self.context)
Fetch one row, just like DB-API ``cursor.fetchone()``.
dataset/ETHPy150Open RoseOu/flasky/venv/lib/python2.7/site-packages/sqlalchemy/engine/result.py/ResultProxy.fetchone