def select(self, sql, parm=None): 
        self.cr.execute(sql, parm) 
        list_header = [row[0] for row in self.cr.description] 
        list_result = [[str(item) for item in row] for row in self.cr.fetchall()] 
        res = [dict(zip(list_header, row)) for row in list_result] 
        # print(list_header) 
        # pprint(list_result) 
        # pprint(res) 
        return res