code: def AddExtraShapes(extra_shapes_txt, graph):
    
  
    print("Adding extra shapes from %s" % extra_shapes_txt)
    try:
      tmpdir = tempfile.mkdtemp()
      shutil.copy(extra_shapes_txt, os.path.join(tmpdir, 'shapes.txt'))
      loader = transitfeed.ShapeLoader(tmpdir)
      schedule = loader.Load()
      for shape in schedule.GetShapeList():
        print("Adding extra shape: %s" % shape.shape_id)
        graph.AddPoly(ShapeToPoly(shape))
    finally:
      if tmpdir:
        shutil.rmtree(tmpdir)
docs: Add extra shapes into our input set by parsing them out of a GTFS-formatted
    shapes.txt file.  Useful for manually adding lines to a shape file, since it's
    a pain to edit .shp files.