Re: Fedora 31 System-Wide Change proposal: Python means Python3

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On Thu, Jun 27, 2019 at 5:20 PM Miro Hrončok <mhroncok@xxxxxxxxxx> wrote:
>
> On 27. 06. 19 17:15, Adam Williamson wrote:
> > On Thu, 2019-06-27 at 12:32 +0200, Miro Hrončok wrote:
> >> On 26. 06. 19 20:07, Adam Williamson wrote:
> >>> On Wed, 2019-06-26 at 13:57 -0400, Ben Cotton wrote:
> >>>> https://fedoraproject.org/wiki/Changes/Python_means_Python3
> >>>>
> >>>> == Summary ==
> >>>> In package and command names, "Python" will mean "Python 3".
> >>>>
> >>>> Users installing and running Python or Python packages without
> >>>> specifying a version will get Python 3.
> >>>>
> >>>> Running <code>python</code> will run <code>python3</code>.
> >>>
> >>> Oh, man. I thought we'd decided against this in the past?
> >>
> >> We did. Circumstances changed.
> >
> > Out of interest, what circumstances?
>
> Mostly date.
>
> https://fedoraproject.org/wiki/Changes/Python_means_Python3#Benefit_to_Fedora
>
> "The name 'Python' will not refer to software that will be unmaintained upstream
> for most of Fedora 31's lifetime and retired from Fedora 32."
>
> Also, before, we have decided to not do this, as it was against the upstream
> recommendation. That recommendation is changing now as Python 2 approaches EOL.
>
> See https://github.com/python/peps/pull/989
>
> >>> I'm worried
> >>> about the cost/benefit ratio on such a change.
> >>
> >> What worries you do most about "the cost"?
> >
> > I mean, generalized existential dread? :)
> >
> > The most obvious is scripts with #!/usr/bin/python . OK, we can try and
> > find every single one in the distro and patch them (though I'm sure
> > some will get missed somehow)
>
> Yes, we've already done that.
> https://fedoraproject.org/wiki/Changes/Move_usr_bin_python_into_separate_package
> https://fedoraproject.org/wiki/Changes/Make_ambiguous_python_shebangs_error
>
> > but there will certainly be ones that
> > *aren't part of the distro* that get bitten by this.
>
> There, you are correct. However, would we want "python" to mean Python 2
> forever? Or do we want to phase things out slowly and make a designated point in
> the future, where this is changed?

I suppose to me the big one with be pypi and what the expectation in
that community is around which version of python points to
/usr/bin/python, have they been running tests against the repositories
there and if it'll break things installed via pip.
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