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$ python2.6
Python 2.6 (r26:66714, Nov 19 2008, 12:48:10) 
[GCC 4.3.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> class Test:
... 	def mygetitem(self, key):
... 		return 42
... 	def __init__(self):    
... 		self.__getitem__ = self.mygetitem
... 
>>> t = Test()
>>> t['blab']    
42

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$ python3.0
Python 3.0rc1+ (py3k, Oct 28 2008, 09:23:29) 
[GCC 4.3.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> 
>>> class Test:
...     def __init__(self):
...             self.__getitem__ = self.mygetitem
...     def mygetitem(self, key):
...             return 42
... 
>>> t = Test()
>>> t['a']
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'Test' object is unsubscriptable
>>> 

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In [4]: class Test(object):
   ...:     def mygetitem(self, key):
   ...:         return 42
   ...:     __getitem__ = mygetitem
   ...:     
   ...:     

In [5]: a = Test()

In [6]: a["5q"]
Out[6]: 42