[cctbxbb] Python 3 and CCP4

[Billy Poon]

Hi David,

The plan is to have code that is compatible with both Python 2 and Python
3. In terms of a post-transition period, I don't think we've though about a
timeline for when we make the switch to Python 3 only, so it's open for
discussion. I'm trying to get things running on Python 3 first!

I don't know if a specific month in 2020 has been set yet for the official
end of Python 2, so the period of Python 2/3 compatibility can probably go
into 2020. And since Python 2.0 source code is still available, I would
guess that Python 2.7 source code will be available for a while in case we
need it past the official end of Python 2.

--
Billy K. Poon
Research Scientist, Molecular Biophysics and Integrated Bioimaging
Lawrence Berkeley National Laboratory
1 Cyclotron Road, M/S 33R0345
Berkeley, CA 94720
Tel: (510) 486-5709
Fax: (510) 486-5909
Web: https://phenix-online.org


On Thu, Nov 1, 2018 at 5:07 AM David Waterman <dgwaterman at gmail.com> wrote:

> Hi folks,
>
> It's great to see the momentum building behind the project to migrate to
> Python 3. From the roadmap
> <https://github.com/cctbx/cctbx_project/wiki/Python-3-roadmap>, there is
> clearly still some way to go, but current activity makes me wonder if the
> proposed deadline of complete migration by 2020 might be beaten easily.
> What is not clear from the roadmap is whether there are any plans for a
> post-transition grace period, in which we have switched from writing
> forwards compatible Python 2 code to writing backwards compatible Python 3
> code. Has this been thought about? Or will it be the case that the first
> commit of Py3-only code seals the deal?
>
> I ask because CCP4 has to support a large number of Python projects and
> these have not all considered the Python 3 switch nearly as seriously as
> cctbx yet. What I would like to request is a reasonable period of backwards
> compatibility is ensured to allow other CCP4 projects to catch up, and that
> this protected period is enshrined within the roadmap or developer
> guidelines. What do you think?
>
> Best wishes
> -- David
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