Python format timedelta greater than 24 hours for display only containing hours?

May be defining your class that inherits datetime.timedelta will be a little more elegant

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'