时间状态

def set_time(self, time):
        """
        时间状态
        """
        rest_time = int(self.song_total_time) - self.time - 1
        minute = int(rest_time) / 60
        sec = int(rest_time) % 60

        return str(minute).zfill(2) + ':' + str(sec).zfill(2)