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Updated PEP 394 (python and python2 commands)

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  Updated PEP 394 (python and python2 commands) Matthias Klose <doko@debian.org> - 2018-05-17 21:00 +0200
    Re: Updated PEP 394 (python and python2 commands) Piotr Ożarowski <piotr@debian.org> - 2018-05-18 11:30 +0200
      Re: Updated PEP 394 (python and python2 commands) Matthias Klose <doko@debian.org> - 2018-05-18 17:40 +0200
        Re: Updated PEP 394 (python and python2 commands) Scott Kitterman <debian@kitterman.com> - 2018-05-18 18:20 +0200
          Re: Updated PEP 394 (python and python2 commands) Matthias Klose <doko@debian.org> - 2018-05-18 19:40 +0200
            Re: Updated PEP 394 (python and python2 commands) Scott Kitterman <debian@kitterman.com> - 2018-05-18 21:20 +0200
        Re: Updated PEP 394 (python and python2 commands) Piotr Ożarowski <piotr@debian.org> - 2018-05-18 19:10 +0200
          Re: Updated PEP 394 (python and python2 commands) Matthias Klose <doko@debian.org> - 2018-05-18 19:20 +0200
            Re: Updated PEP 394 (python and python2 commands) Piotr Ożarowski <piotr@debian.org> - 2018-05-18 19:30 +0200
              Re: Updated PEP 394 (python and python2 commands) Matthias Klose <doko@debian.org> - 2018-05-18 19:40 +0200
                Re: Updated PEP 394 (python and python2 commands) Stuart Prescott <stuart@debian.org> - 2018-05-19 07:30 +0200
                  Re: Updated PEP 394 (python and python2 commands) Matthias Klose <doko@debian.org> - 2018-06-08 19:10 +0200
                    Re: Updated PEP 394 (python and python2 commands) Piotr Ożarowski <piotr@debian.org> - 2018-06-10 14:00 +0200
                      Re: Updated PEP 394 (python and python2 commands) Matthias Klose <doko@debian.org> - 2018-09-25 21:40 +0200
                        Re: Updated PEP 394 (python and python2 commands) Piotr Ożarowski <piotr@debian.org> - 2018-09-25 23:20 +0200
    Re: Updated PEP 394 (python and python2 commands) Thomas Goirand <zigo@debian.org> - 2018-05-20 23:50 +0200
      Re: Updated PEP 394 (python and python2 commands) Scott Kitterman <debian@kitterman.com> - 2018-05-21 01:40 +0200
        Re: Updated PEP 394 (python and python2 commands) Thomas Goirand <zigo@debian.org> - 2018-05-22 09:10 +0200
      Re: Updated PEP 394 (python and python2 commands) Thomas Goirand <zigo@debian.org> - 2018-05-22 21:30 +0200
        Re: Updated PEP 394 (python and python2 commands) Scott Kitterman <debian@kitterman.com> - 2018-05-23 02:10 +0200
    Re: Updated PEP 394 (python and python2 commands) Thomas Goirand <zigo@debian.org> - 2018-05-22 21:00 +0200

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#10575

On 05/17/2018 08:53 PM, Matthias Klose wrote:
> PEP 394 [1] saw an update in April 2018 [2], the diffs at [3].
> 
> The most important change from my point of view is
> 
> -* It is suggested that even distribution-specific packages follow the
> -  ``python2``/``python3`` convention, even in code that is not intended to
> +* It is strongly encouraged that distribution-specific packages use ``python2``
> +  or ``python3`` rather than ``python``, even in code that is not intended to
>    operate on other distributions.
> 
> I don't think there is enough time to replace all python shebangs to python2 in
> time for the buster release, however there is no harm in starting this process
> now.  But I'd like to get this done for buster+1, in the case we still need to
> ship a Python2/2.7, so that buster+1 doesn't ship with a python command, but
> maybe with a python2 command.
> 
> The first step is to create a set of python2* packages in python-defaults, with
> contain all the python2* symlinks, and having the python* packages depend on
> those python2 packages.  This change itself is a no-op and shouldn't affect
> anything.
> 
> As a second step change the dh_python2 (in python-defaults), and dh-python to
> generate dependencies on python2 instead of python, and replacing the shebang
> from python to python2.
> 
> This should cover the majority of packages to replace dependencies on python
> with dependencies on python2.  There are packages which don't check for python2,
> so these probably need adjustments.  But again, the goal for buster+1 is to ship
> as few Python2 dependent packages as possible, if any.
> 
> The third step for buster+1 would be to drop the set of python* packages from
> python-defaults.
> 
> Both Debian 8 and Debian 9 already have the python2 symlink, so you could even
> reuse binary packages in the older releases.  If needed, python-defaults could
> be packported to Debian 9 using versioned provides, and to Debian 8 introducing
> the same set of python2 packages.
> 
> Matthias

Hi Matthias,

We need to clear-out something.

Is your proposal includes changing:
"Build-Depends: python{,-all,-dev}"

with:
"Build-Depends: python2{,-all,-dev}"

I don't think that's part of your proposal, but it looks like someone
understood this, I'm not sure why.

Cheers,

Thomas Goirand (zigo)

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