overriding a tuple's __init__

[Simon Burton]

Python 2.2.2 (#2, Nov 24 2002, 11:41:06) 
[GCC 3.2 20020903 (Red Hat Linux 8.0 3.2-7)] on linux2
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>>> class pair(tuple):
...   def __init__(self,a,b):
...     tuple.__init__(self, (a,b) )
... 
>>> a=pair(1,2)
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
TypeError: tuple() takes at most 1 argument (2 given)
>>> 

What gives? (yes it works with a list, but i need immutable/hashable)

Simon Burton.