Small-int interning.
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Why does Python cache small integers?
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intcachinginterning
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CPython pre-creates and reuses int objects from -5 to 256, so identical small ints share one object, which is why 'is' can surprise you on numbers.
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PYIdentity in the cache range vs outside it
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Dossier 63 of 120 decoded in the Python track. One more won't hurt.