[vtk-developers] vtkInteratorStyle python subclass instantiation: TypeError: method requires a string argument

David Lonie david.lonie at kitware.com
Wed Aug 26 15:02:30 EDT 2015

I'm updating some code for a client to use current VTK master, and there's
an error while instantiating a python class that derives from
vtkInteractorStyle. It seems to be related to __init__ taking an extra
parameter which is used by the subclass to initialize some internals.

A minimal example that reproduces the error:

import vtk

class MyInteractorStyle(vtk.vtkInteractorStyleUser):
  def __init__(self, arg):

obj = MyInteractorStyle(2)

$ vtkpython test.py
Traceback (most recent call last):
  File "/tmp/test.py", line 7, in <module>
    obj = MyInteractorStyle(2)
TypeError: method requires a string argument

Removing the extra argument from __init__ will make the error go away.

This worked a few months ago last time we bumped their VTK version. Is this
a bug?

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