docs: def format_sec_to_dhm(sec):
      """Format seconds to days, hours, minutes.
  
      Args:
        sec: float or int
          Number of seconds in a period of time
  
      Returns:
        Period of time represented as a string on the form ``0d:00h:00m``.
  
      """
      rem_int, s_int = divmod(int(sec), 60)
      rem_int, m_int, = divmod(rem_int, 60)
      d_int, h_int, = divmod(rem_int, 24)
      return '{}d{:02d}h{:02d}m'.format(d_int, h_int, m_int)