code: def parse(cls, fptr, offset, length):
          
          num_bytes = offset + length - fptr.tell()
          raw_data = fptr.read(num_bytes)
          num_associations = int(len(raw_data) / 4)
          lst = struct.unpack('>' + 'I' * num_associations, raw_data)
          return cls(lst, length=length, offset=offset)
docs: Parse number list box.
  
          Parameters
          ----------
          fptr : file
              Open file object.
          offset : int
              Start position of box in bytes.
          length : int
              Length of the box in bytes.
  
          Returns
          -------
          LabelBox
              Instance of the current number list box.