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

Maciej Fijalkowski fijall at gmail.com
Wed Jan 20 14:02:53 EST 2016

On Wed, Jan 20, 2016 at 8:00 PM, Yury Selivanov <yselivanov.ml at gmail.com> wrote:

On 2016-01-20 1:36 PM, Maciej Fijalkowski wrote:

On Wed, Jan 20, 2016 at 7:22 PM, Brett Cannon <brett at python.org> wrote:

On Wed, 20 Jan 2016 at 10:11 Yury Selivanov <yselivanov.ml at gmail.com> wrote: [..] "maextra" would also make it easier for us to extend dicts in the future. Why can't you simply use the id of the dict object as the globally unique dict ID? It's already globally unique amongst all Python objects which makes it inherently unique amongst dicts. Brett, you need two things - the ID of the dict and the version tag. What we do in pypy is we have a small object (called, surprisingly, VersionTag()) and we use the ID of that. That way you can change the version id of an existing dict and have only one field. Yeah, that's essentially what I propose with maextra. Yury

The trick is we use only one field :-)

you're proposing to have both fields - version tag and dict id. Why not just use the id of the object (without any fields)?

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