On Sat, Aug 04, 2012 at 03:50:56AM -0400, Bohuslav Kabrda wrote: > ----- Original Message ----- > > On Fri, Aug 03, 2012 at 04:42:02AM -0400, Bohuslav Kabrda wrote: > > > ----- Original Message ----- > > > > On Fri, Aug 3, 2012 at 8:57 AM, Bohuslav Kabrda > > > > <bkab...@redhat.com> > > > > wrote: > > > > > Hi, > > > > > I'd like to start a discussion about the release where we > > > > > should > > > > > switch to Python 3. As I have learned recently, Ubuntu 12.10 > > > > > will > > > > > have Python 3 as default [1], which makes me a sad panda :( > > > > > We always take pride in being close to upstream and having the > > > > > bleeding edge. Python 3 is stable and more and more libraries > > > > > support it. So I'd like to propose an idea to switch to Python > > > > > 3 > > > > > for Fedora 19. > > > > > > > > In which a way do you want to switch to python3? > > > > For me, that means any mention of "python" is synonym to > > > > "python3", > > > > which leads to the question, what is inside a python-foo package? > > > > The module foo, built for python3? > > > > > > > > > > As you say, switching means /usr/bin/python -> /usr/bin/python3. > > > And yes, that is a very valid point about the naming, I think. > > > > > Porting, taking those ports upstream, and even *tiny shudder* > > carrying those > > python3 patches locally for a loooong time, I could support. > > > > Switching /usr/bin/python to point to /usr/bin/python3 I'd be very > > much > > against (at least for several years): > > http://www.python.org/dev/peps/pep-0394/ > > > > has a section that says it may someday be updated to recommend > > changing > > a /usr/bin/python symlink to point at python3. I would wait to make > > the > > link change until that PEP is updated (or many other unix > > distributions are > > also ready to make the switch). Switching the link is a largely > > symbolic > > gesture that creates more work for package maintainers, more work for > > end > > users, and more work for developers (who all have to find uses of > > /usr/bin/python and change them to /usr/bin/python2). > > > > Well, my opinion is different on this. The PEP says that bleeding edge > distributions may have python3 as a default. And I like to think of Fedora as > bleeding edge. > The only distribution that has switched is arch. When they did there was a big uproar about how arch was doing something wrong which eventually resulted in that PEP.
/usr/bin/python is a program that end users depend on being a certain thing -- it shouldn't be used to set policy. That would be like us deciding we wanted to switch the default shell from /bin/bash to /bin/zsh and to implement that policy we were going to symlink /bin/bash to /bin/zsh. Users wanting /bin/bash would need to update their scripts, tools, and practices to reference /bin/gnu-bash. -Toshio
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