Multirelease effort: Moving to Python 3

[Toshio Kuratomi]

On Fri, Jul 19, 2013 at 11:58:35AM -0400, John.Florian at dart.biz wrote:
> > From: tmraz at redhat.com
> >
> > On Fri, 2013-07-19 at 11:24 -0400, John.Florian at dart.biz wrote:
> > >
> > >
> > > Excellent point!  If I were caught unaware, I'd much rather have to fix up
> > > a bunch shebang lines and learn that I need to get going on my migration
> > > pronto than the alternative of finding one day that python2 is just gone
> > > where one is left with either a hurried port or downloading python2 from
> > > external sources.
> >
> > The heads-up can be done before the python2 dropping by
> > removing /usr/bin/python from python2 package.
> 
> Ah, true indeed.  However, I still like the idea of being explicit.  If you
> want py2, say so in the shebang line.  Likewise with py3.  How can we get the
> very blunt "head's up" and be explicit too?  I have no idea when py2 will truly
> go away, but I'm convinced it will eventually and I'd like to create my works
> in the best possible fashion.  Thus far I've relied on the implicit py->py2 and
> explicit py3 invocations as that's the way I've seen Fedora set examples, but I
> think this should really be more detailed in the packaging guidelines.
> 
I'm not sure if this is a good idea (or in what time frame it may be a good
idea.  It's definitely too early now and likely too early for F22) but -- if
you want something explicit, we could replace /usr/bin/python with something
that prints out an error message to switch shebang lines to use
/usr/bin/python2 and exits.

(Perhaps a warning message to switch shebang lines could be done now,
though).

-Toshio
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