@dsa934 Are you trying to wrap VTK with python bindings? VTK has its own code to generate (non-pybind11) bindings. Or are you trying to mix VTK’s python objects with some other code?
The code you reference is from SMTK, not VTK; if you are trying to use SMTK’s VTK support, it might be better to ask on the SMTK discourse site instead of here.
The code you’ve provided doesn’t have enough information for me to understand the problem. Having the error message or a stack trace would also be helpful.