[Python-Dev] Any PEP about 2.6 -> 3000 code transition?

[Gregory P. Smith]

Of particular interest to bsddb is the pep3118 buffer API.  I updated
the existing bsddb module found in the py3k branch to use it last
fall; you may want to use the changes made to it as an example.

I agree, a single C code base is the only sane way forward for bsddb.
The interesting part is that you also want to support older python
versions (2.3-2.5?) as well so _bsddb.c & bsddb.h become a nice
example of how to write code that spans multiple python versions.

I expect it is less difficult than it sounds.

 http://www.python.org/dev/peps/pep-3118/

I believe the buffer api is supposed to be backported to 2.6?  I
haven't followed the status of that.  If so, bsddb should use it in
2.6 as well.

-gps

On Sat, May 24, 2008 at 9:25 PM, Jesus Cea <jcea at jcea.es> wrote:
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> I can't find any PEP about detailed 2.6 -> 3000 migration guidelines,
> specially in the module (C code) extension area. Yes, I know about the
> 2to3 tool, but I'm interested in updating my 2.x code in order to keep
> (automatic via "2to3") difference between 2.x and 3.x codebase so small
> as possible. Also, 2to3 doesn't manage migration for C modules.
>
> Since I need to port bsddb3 to py3k, what I need to know?. Is any
> *updated* document out there?.
>
> PS: My plan is keep working in the python side under 2.x, and manage
> Python 3.0 via "2to3", for a long time. In the C side, I plan keeping
> the same codebase, with conditional compilation. Ideas?.
>
> - --
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