In c++, QVTKOpenGLNativeWidget can be included.
For python vtk, I also want to import QVTKOpenGLNativeWidget, is it possible? How can I import QVTKOpenGLNativeWidget?
No, you cannot import QVTKOpenGLNativeWidget in Python because the Python bindings for VTK doesn't have that class (as of VTK 8.2.0). A quick grep doesn't find it anywhere in the VTK python package. I grepped /usr/lib64/python3.6/site-packages/vtk* (which is where I have python3-vtk installed) recursively for QVTKOpenGLNativeWidget and grep didn't find anything.
python vtk: how to import QVTKOpenGLNativeWidget