class SmnpException(Exception):
    def __init__(self, msg, pos):
        self.msg = msg
        self.pos = pos

    def _title(self):
        pass

    def _postMessage(self):
        return ""

    def _position(self):
        return "" if self.pos is None else f" [line {self.pos[0]+1}, col {self.pos[1]+1}]"

    def message(self):
        return f"{self._title()}{self._position()}:\n{self.msg}\n{self._postMessage()}"