[Python-Dev] Guarantee ordered dict literals in v3.7? (original) (raw)

Steve Holden steve at holdenweb.com
Mon Nov 6 06🔞50 EST 2017

On Mon, Nov 6, 2017 at 10:18 AM, Paul Sokolovsky <pmiscml at gmail.com> wrote:

Hello,

What happens now borders on technologic surrealism - the CPython, after many years of persuasion, switched its dict algorithm, rather inefficient in terms of memory, to something else, less inefficient (still quite inefficient, taking "no overhead" as the baseline). That algorithm randomly had another property. Now there's a seemingly serious talk of letting that property leak into the language spec, despite the fact that there can be unlimited number of dictionary algorithms, most of them not having that property. ​ I have to agree: I find the elevation of a CPython implementation detail to a language feature ​somewhat hard to comprehend. Maybe it's more to do with the way it's been presented, but this is hardly an enhancement the language has been screaming for for years.

​Presumably there is little concern that algorithms that rely on this behaviour will be perfectly syntactically conformant with earlier versions​ but will fail subtly and without explanation? It's a small concern, but a real one - particularly for learners.

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