code: def timedelta_to_str(aTimedelta):
      
      days = aTimedelta.days
      temp_seconds = aTimedelta.seconds
      hours = int(temp_seconds / 3600)
      minutes = int((temp_seconds - hours * 3600) / 60)
      seconds = temp_seconds - hours * 3600 - minutes * 60
      return '%d %02d:%02d:%02d' % (days, hours, minutes, seconds)
docs: a conversion function for time deltas to string in the form
      DD:HH:MM:SS