Python格式的timedelta大于24小时，仅显示小时？

可能定义继承的类

datetime.timedelta

class mytimedelta(datetime.timedelta):   def __str__(self):      seconds = self.total_seconds()         hours = seconds // 3600         minutes = (seconds % 3600) // 60         seconds = seconds % 60         str = '{}:{}:{}'.format(int(hours), int(minutes), int(seconds))         return (str)td = mytimedelta(hours=36, minutes=10, seconds=10)>>> str(td)prints '36:10:10'