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Date: Fri, 12 Dec 2014 14:58:03 -0500
From: Barry Warsaw <barry@python.org>
To: Petr Viktorin <encukou@gmail.com>
Subject: Re: [Python-Dev] Python 2.x and 3.x use survey, 2014 edition
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On Dec 12, 2014, at 08:07 PM, Petr Viktorin wrote:

>If anyone is wondering why their favorite Linux distribution is stuck with
>Python 2 =E2=80=93 well, I can only speak for Fedora, but nowadays most of=
 what's
>left are CPython bindings.  No pylint --py3k or 2to3 will help there...

It's true that some of these are tough.  I tried and failed a few times to
port Xapian to Python 3.  The issue was opened upstream 6 years ago and it's
still unresolved: http://trac.xapian.org/ticket/346

OTOH, I ported dbus-python to Python 3 and that worked out much better; we'=
ve
had solid Python 3 bindings for several years now, which allowed us to port
many important Debian/Ubuntu tools to Python 3 and more importantly, do all
our new work in Python 3.  With other big toolkits like GObject introspecti=
on
working on Python 3, there's a lot you can do.

IME, if the underlying model is string/bytes clean, then the C extension po=
rt
can sometimes be easier than pure-Python, thanks to cpp games.  D-Bus's mod=
el
is pretty clean, Xapian I found to be not so much (it doesn't help that Xap=
ian
is C++ ;).

We're actually not terribly far from switching Debian and Ubuntu's default
to Python 3.  On Debian, the big blocker is the BTS code (which uses SOAP) =
and
on Ubuntu it's the launchpadlib stack.  I hope to find time after Jessie to
work on the former, and before 16.04 LTS to work on the latter.

Not that I disagree that there's a long tail of code that would still benef=
it
a significant population if it got ported to Python 3.  By far Python 3 is a
better language, with a better stdlib, so the work is worth it.

Cheers,
-Barry