code: def find_range_ix_in_point_list(start, end, point_list):
      
      return [point_list.bisect_left(start), point_list.bisect_right(end)]
docs: Returns the index range all points inside the given range.
  
      Parameters
      ---------
      start : float
          The start of the desired range.
      end : float
          The end of the desired range.
      point_list : sortedcontainers.SortedList
          A list of points.
  
      Returns
      -------
      iterable
          The index range of all points inside the given range.
  
      Example
      -------
      >>> from sortedcontainers import SortedList
      >>> point_list = SortedList([5, 8, 15])
      >>> find_range_ix_in_point_list(3, 4, point_list)
      [0, 0]
      >>> find_range_ix_in_point_list(3, 7, point_list)
      [0, 1]
      >>> find_range_ix_in_point_list(3, 8, point_list)
      [0, 2]
      >>> find_range_ix_in_point_list(4, 15, point_list)
      [0, 3]
      >>> find_range_ix_in_point_list(4, 321, point_list)
      [0, 3]
      >>> find_range_ix_in_point_list(6, 321, point_list)
      [1, 3]