How to Open Step File in VTK

I can’t find any document about vtkOCCTReader in python,
from vtkmodules.vtkIOLegacy import vtkOCCTReader
comes with

from vtkmodules.vtkIOLegacy import vtkOCCTReader
ImportError: cannot import name 'vtkOCCTReader' from 'vtkmodules.vtkIOLegacy'

Is there any python example?