code: def _seconds_to_HHMMSS(seconds):
          
          less_than_second = seconds - floor(seconds)
          minutes, seconds = divmod(floor(seconds), 60)
          hours, minutes = divmod(minutes, 60)
          return "{}H{}M{}S.{}".format(hours, minutes, seconds, less_than_second)
docs: Retuns a string which is the hour, minute, second(milli) representation
          of the intput `seconds`
  
          Parameters
          ----------
          seconds : float
  
          Returns
          -------
          str
              Has the form <int>H<int>M<int>S.<float>