Consume a VTK event in Python

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After further investigation I managed by

  1. adding an observer on CharEvent with higher priority than the one that is in the interactor. Earlier I used KeyPressEvent which was not correct.
  2. modifying the key code of the event. I set it to no character to be absolutely sure
def consumeCharEvent(interactor, event):
    if interactor.GetKeyCode() in ['s', 'w']:
        interactor.SetKeyCode("")

iren = vtk.vtkRenderWindowInteractor()
iren.AddObserver("CharEvent", consumeCharEvent, 10)

To make it a clean job I would like to be able to get the priority of the CharEvent observer I want to override. I do not seem to find a way to get any observers from a vtkObject, but printing the object (the interactor) I can find the observer priority and tag.

vtkObserver (000001F012EB9910)
        Event: 22
        EventName: CharEvent
        Command: 000001F012ECA480
        Priority: 0
        Tag: 81

Any help is welcome

Edo