TypeError error on tkinter.createfilehandler dummy example

[David]

Hi,

I'm getting the following error:


Traceback (most recent call last):
  File "..\kk.py", line 37, in ?
    tkinter.createfilehandler(filex, tkinter.READABLE, _dispatch)
TypeError: 'NoneType' object is not callable


when executing this code on my Windows box:


from Tkinter import *

def _dispatch(self, *args):
  print "voila"

filex = open('d:\\zz.txt', 'r')
tkinter.createfilehandler(filex, tkinter.READABLE, _dispatch)


Any ideas? What am I missing? I've been searching for something like 
this with no luck. I cannot imagine a simpler code for testing 
tkinter.createfilehandler functionality but it does not work :(


TIA

-- 
David Santiago

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