Please help about an instance var

[JStoneGT at aol.com]

>>> from UserDict import UserDict
>>> d =  {1:2,3:4,5:6}
>>> d1 = UserDict(d)
>>> d1
{1: 2, 3:  4, 5: 6}
>>> d1.data
{1: 2, 3: 4, 5: 6}
 
Here why both d1 and d1.data have the same values?As shown below,they're  
different types.
 
>>> type(d1)
<type 'instance'>
>>>  type(d1.data) 
<type 'dict'>
 
 
Please help.Thanks!
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