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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def mode_readable(self):
 """Return a readable representation of the mode.."""

        ret = ""
        mode = self._raw_mode

        if mode.MANUAL:
            ret = "manual"
            if self.target_temperature < self.min_temp:
                ret += " off"
            elif self.target_temperature >= self.max_temp:
                ret += " on"
            else:
                ret += " (%sC)" % self.target_temperature
        else:
            ret = "auto"

        if mode.AWAY:
            ret += " holiday"
        if mode.BOOST:
            ret += " boost"
        if mode.DST:
            ret += " dst"
        if mode.WINDOW:
            ret += " window"
        if mode.LOCKED:
            ret += " locked"
        if mode.LOW_BATTERY:
            ret += " low battery"

        return ret