code: def parents(args):
      
      p = OptionParser(parents.__doc__)
  
      opts, args = p.parse_args(args)
  
      if len(args) != 2:
          sys.exit(not p.print_help())
  
      gff_file, idsfile = args
      g = make_index(gff_file)
      fp = open(idsfile)
      for row in fp:
          cid = row.strip()
          b = next(g.parents(cid, 1))
          print("\t".join((cid, b.id)))
docs: %prog parents gffile models.ids
  
      Find the parents given a list of IDs in "models.ids".