is operator

Matt Nordhoff mnordhoff at
Mon Mar 10 11:11:12 CET 2008

castironpi at wrote:
>> I believe Python automatically creates and caches int objects for 0-256,
>> so whenever you use them, they refer to the same exact objects. Since
>> ints are immutable, it doesn't matter.
> One of the biggest hits on start-up time, by the way.  ;)

Well, the developers clearly decided it was worth it at the time. Who
knows, perhaps that's changed since then.

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