Equality and identity

[Marius Bernklev]

In python, it seems like immutable objects are equal under both
equality and identity:

>>> 5 == 5
True
>>> 5 is 5
True
>>> "hei" == "hei"
True
>>> "hei" is "hei"
True

But that isn't true for tuples:
>>> (5,2) == (5,2)
True
>>> (5,2) is (5,2)
False

Why not?  Are tuples mutable in some way I've missed, or are there
other reasons for this behaviour?  To me, it seems natural to concider
(5,2) and (5,2) the same object, just like "5,2" and "5,2".


Marius
-- 
        "Who needs crypto WYCWLT?"
                -- William Newman