How to use the pgspecial.main.CommandNotFound function in pgspecial

def execute(self, cur, sql):
        commands = self.commands
        command, verbose, pattern = parse_special_command(sql)

        if (command not in commands) and (command.lower() not in commands):
            raise CommandNotFound

        try:
            special_cmd = commands[command]
        except KeyError:
            special_cmd = commands[command.lower()]
            if special_cmd.case_sensitive:
                raise CommandNotFound('Command not found: %s' % command)

        if special_cmd.arg_type == NO_QUERY:
            return special_cmd.handler()
        elif special_cmd.arg_type == PARSED_QUERY:
            return special_cmd.handler(cur=cur, pattern=pattern, verbose=verbose)
        elif special_cmd.arg_type == RAW_QUERY:
            return special_cmd.handler(cur=cur, query=sql)

def execute(self, cur, sql):
        commands = self.commands
        command, verbose, pattern = parse_special_command(sql)

        if (command not in commands) and (command.lower() not in commands):
            raise CommandNotFound

        try:
            special_cmd = commands[command]
        except KeyError:
            special_cmd = commands[command.lower()]
            if special_cmd.case_sensitive:
                raise CommandNotFound('Command not found: %s' % command)

        if special_cmd.arg_type == NO_QUERY:
            return special_cmd.handler()
        elif special_cmd.arg_type == PARSED_QUERY:
            return special_cmd.handler(cur=cur, pattern=pattern, verbose=verbose)
        elif special_cmd.arg_type == RAW_QUERY:
            return special_cmd.handler(cur=cur, query=sql)