code: def dateint_range(first_dateint, last_dateint):
      
      first_datetime = dateint_to_datetime(first_dateint)
      last_datetime = dateint_to_datetime(last_dateint)
      delta = last_datetime - first_datetime
      delta_in_hours = math.ceil(delta.total_seconds() / 3600)
      delta_in_days = math.ceil(delta_in_hours / 24) + 1
      dateint_set = set()
      for delta_i in range(0, delta_in_days * 24, 24):
          datetime_i = first_datetime + timedelta(hours=delta_i)
          dateint_i = datetime_to_dateint(datetime_i)
          if dateint_i <= last_dateint:
              dateint_set.add(dateint_i)
      return sorted(dateint_set)
docs: Returns all dateints in the given dateint range.
  
      Arguments
      ---------
      first_dateint : int
          An integer object decipting a specific calendaric day; e.g. 20161225.
      last_dateint : int
          An integer object decipting a specific calendaric day; e.g. 20170108.
  
      Returns
      -------
      iterable
          An iterable of ints representing all days in the given dateint range.
  
      Example
      -------
      >>> dateint_range(20170228, 20170301)
      [20170228, 20170301]
      >>> dateint_range(20170225, 20170301)
      [20170225, 20170226, 20170227, 20170228, 20170301]