<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def temp_unit(self):
 """Get unit of temp."""

        if CONST.UNIT_FAHRENHEIT in self._get_status(CONST.TEMP_STATUS_KEY):
            return CONST.UNIT_FAHRENHEIT
        elif CONST.UNIT_CELSIUS in self._get_status(CONST.TEMP_STATUS_KEY):
            return CONST.UNIT_CELSIUS
        return None