[vtkusers] TypeError: cannot create 'vtkclass' instances

[sebastien]

Hello
I begin with python and I have this problem.
I wand to create a new vtkInteractorStyle so I have
creae a nex class like this
from vtkpython import *

class sliceInteractorStyle(vtkInteractorStyleSwitch) :

  
    def OnChar(ctrl,shift,keycode,repeatcount):
        if keycode=="+" :
           ...
        elif keycode=="-" :
           ...
        else:
           ...

I have the error "TypeError: cannot create 'vtkclass'
instances  " , on the line 
class sliceInteractorStyle(vtkInteractorStyleSwitch) :

Thank you for your help



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