Python 2.6.6 (r266:84297, Aug 24 2010, 18:46:32) [MSC v.1500 32 bit (Intel)] on win32
    
IDLE 2.6.6      
>>> round(10.3333, 3)
10.333
>>> round(10.3333, 2)
10.33
>>> round(10.3333, 1)
10.300000000000001
>>> 
>>> round(1.33333, 3)
1.333
>>> round(1.3333, 2)
1.3300000000000001
>>>