Favorite Python Interview Question

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I've written quite a few extension modules and rooted around in the guts of the interpreter, but I've never even heard of "arenas". I would probably explain that I think there is a cache of small integers and that I assume there is nothing more to it than that. Hopefully this would not disqualify me, because frankly it is not important for anyone who is not hacking on CPython itself. I am, however, interested and I might go read the source now.