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Why is int variable id in python 2.7 equal to only 256?

Why is int variable id's in python 2.7 only equal to 256?

For example:

 >>> y = 256 >>> m = 256 >>> m is y True >>> y = 257 >>> m = 257 >>> id(m) 16282096 >>> id(y) 16281952 >>> m is y False
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