F21/F22 System Wide Change: Python 3 as the Default Implementation

[Jan Zelený]

On 18. 10. 2013 at 09:35:36, Toshio Kuratomi wrote:
> On Fri, Oct 18, 2013 at 09:19:30AM +0200, Ales Kozumplik wrote:
> > On 10/16/2013 11:13 PM, Toshio Kuratomi wrote:
> > >* Need to clarify if the DNF bindings will exist for both python2 and
> > >
> > >   python3 or just python3.  This could affect releng, mock maintainer,
> > >   etc.
> > 
> > Until Anaconda is in Python 2, DNF will support both Py2 and Py3.
> > Once Anaconda switches to Py3 DNF will officially drop support for
> > Py2. Same for hawkey.
> > 
> > At least that's the plan but we have no problem prolonging the
> > Py2/Py3 period for a Fedora release or two. Though it would be very
> > preferable to have a solid set date.
> 
> Okay -- deciding on that date will likely also need to coordinate with
> releng, fedpkg maintainers (dgilmore who is also releng), and the mock
> maintainers.  There may be other projects I'm not thinking of (yum-utils and
> createrepo are going to be ported to DNF-python3 by the packaging team
> already?  )  I'm concerned about the tools used to build fedora and the
> tools used by package maintainers and testers to create packages.

Some of them will be rewritten to Py3 but for example createrepo has now a C 
implementation and we are planning for that one to be the default.

> Oh also -- I've been assuming that the DNF python2 bindings will be
> compatible with the yum API.  Is that the case?

Sort of. The problem is that while yum has some sort of API, there is no 
official and well documented one, therefore some plugins and tools built on top 
of yum use some of its internals. The plan in this area is to define an API as 
similar to the old one as possible well before F21 and then dedicate one whole 
release to adapt tools using yum to dnf.

Does that make sense?

Thanks
Jan