[vtkusers] 'vtkCommonCorePython.vtkCallbackCommand' object has no attribute 'SetCallback'

[J.]

According to the tutorials and example code, you can create a
vtkCallbackCommand() object and then call SetCallback on it with a callback
function, as in:

  vtkSmartPointer<vtkCallbackCommand> keypressCallback =
      vtkSmartPointer<vtkCallbackCommand>::New();
  keypressCallback->SetCallback ( func );

However, when I try this with Python, I get*
'vtkCommonCorePython.vtkCallbackCommand' object has no attribute
'SetCallback'*. I'm using vtk 8:

def onClick():
    print("Hello, World!")

onClickCallback = vtk.vtkCallbackCommand()
onClickCallback.SetCallback(onClick)
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