Tuple slices

[Steven Bethard]

Fredrik Lundh wrote:
> George Sakkis wrote:
> 
>>Why does slicing a tuple returns a new tuple instead of a view of the existing one, given that
>>tuples are immutable ?
> 
> really?
> 
> 
>>>>a = 1, 2, 3
>>>>b = a[:]
>>>>a is b
> True

My impression was that full tuple copies didn't actually copy, but that 
slicing a subset of a tuple might.  Not exactly sure how to test this, but:

py> a = 1, 2, 3
py> a[:2] is a[:2]
False

So _something_ at least is different between the two slices...

Steve