[Python-Dev] RFC: PEP 509: Add a private version to dict (original) (raw)

Victor Stinner victor.stinner at gmail.com
Fri Apr 15 17:38:51 EDT 2016

Hi,

FYI I updated the implementation of the PEP 509: https://bugs.python.org/issue26058

2016-04-15 11:01 GMT+02:00 Antoine Pitrou <antoine at python.org>:

Why do this? It's a nice property that two dicts always have different version tags, and now you're killing this property for... no obvious reason?

Do you really think dict.clear() is in need of micro-optimizing a couple CPU cycles away?

So, I played with Armin's idea. I confirm that it works for my use case, guards on dict keys. It should also work on Yury's use case.

Antoine is right, it's really a micro-optimization. It shouldn't help much for the integer overflow (which is not a real issue in practice).

I propose to leave the PEP unchanged to keep the nice property of unique identifier for empty dictionaries. It can help for future use cases.

Victor

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