Extensions: py3 compatibility metadata

[Gregory Szorc]

On Wed, May 13, 2020 at 5:18 AM Georges Racinet <georges.racinet at octobus.net>
wrote:

> Hi all,
>
> I don't think we have anything for third party extensions to claim their
> compatibility with Mercurial on Python 3.
>
> Would it be a good idea to add new metadata, such as `py3testedwith` or
> `py3minimumhgversion`?
>

I had thought about this a while ago as well and never got around to
submitting patches. I think it would be a good idea to have more source
level annotations for extensions to mark compatibility with Mercurial,
Python, etc versions/environments. One could even imagine a configuration
mode where Mercurial refuses to load extensions unless they have
annotations indicating they are compatible. This would be a "safe" way to
transition from Python 2 to 3.
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