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Message: [QUOTE="Peter Hansen, post: 1734987"] It's equally "obvious" with integers, if you pick values above 99 or below -5 (found by experimentation this time, as my memory is always poor, and using Python 2.3.1). Try a = 99 b = 99 a is b (returns True) a = 100 b = 100 a is b (returns False) Values between -5 and 99 inclusive are basically pre-created and "interned" so that you never get multiple integer instances with the same values in this range. Those outside this range are not treated specially like this. -Peter [/QUOTE]