如何在Python-VTK中禁用VTK的热键

import vtk

class CustomInteractor(vtk.vtkRenderWindowInteractor):
    def __init__(self, parent=None):
        vtk.vtkRenderWindowInteractor.__init__(self, parent)

    def KeyPressEvent(self, obj, event):
        key = self.GetKeySym()
        # 在这里添加你想要禁用的热键的处理逻辑
        # 例如，禁用"A"键
        if key == "a":
            return
        # 其他热键的处理逻辑
        # ...

        # 如果不是禁用的热键，则调用父类的KeyPressEvent方法处理
        vtk.vtkRenderWindowInteractor.KeyPressEvent(self, obj, event)

renderWindow = vtk.vtkRenderWindow()
renderer = vtk.vtkRenderer()
renderWindow.AddRenderer(renderer)

interactor = CustomInteractor()
interactor.SetRenderWindow(renderWindow)

actor = vtk.vtkActor()
mapper = vtk.vtkPolyDataMapper()
actor.SetMapper(mapper)
renderer.AddActor(actor)

polyData = vtk.vtkPolyData()
mapper.SetInputData(polyData)

interactor.Initialize()
renderWindow.Render()
interactor.Start()