def METHOD_NAME():
  mesh = Mesh(os.environ["DATA"] + "/mesh1.vtk")
  field = mesh.getField("scalars", Mesh.Point)
  origval = field[6543]
  field[6543] = 42
  return origval != mesh.getFieldValue("scalars", 6543) and mesh.getFieldValue("scalars", 6543) == 42