The switch to python 3.9?

hjkl · Posted: Thu May 06, 2021 7:49 am Post subject: The switch to python 3.9?

Hi,

I just read that Gentoo will be switching to python 3.9 as the default in July.

However, after reading it, I want to take the safe approach but there's one catch:

Banana · Veteran Joined: 21 May 2004 Posts: 1406 Location: Germany

both, then update, switch update and then remove and update

But only if you are really have a need to set those variables. If you do not have this case, remove them completely
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hjkl · Posted: Thu May 06, 2021 8:31 am Post subject:

Banana · Veteran Joined: 21 May 2004 Posts: 1406 Location: Germany

Well then comment them with a # and try it for yourself. Could be a lot of rebuilds but will safe some headaches in the future.
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EasterParade · l33t Joined: 26 Jul 2003 Posts: 938

May I, guys?
I just read the news item about the envisioned switch to python-3.9 in June.
There´s a reason why it is so long, a wall of text and many, many options to choose from as any python upgrade may break your system.
But let´s ask real quick: if no PYTHON_TARGETS and PYTHON_SINGLE_TARGETS are set in make.conf what are the chances that the switch
will go well as to be expected? Or IF nothing is set in make.conf can I trust portage to do the upgrade smoothly?

Edit I just ran equery d python and saw that the only package that cannot run on python 3.9 as of now is alsa-libs. If there is no update of alsa-libs
that eliminates its dependency of python 3.8 I´d need to put that into package.use with PYTHON_SINGLE_TARGET=python-3.8 :?:

NeddySeagoon · Posted: Thu May 06, 2021 5:13 pm Post subject:

transsib,

Trust but verify :)
and don't be first.

My reading of the mailing list is that Gentoo isn't quite ready for Python-3.9 only yet.
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EasterParade · l33t Joined: 26 Jul 2003 Posts: 938

Then if you allow me to ask you, NeddySeagoon (happy to talk to you again

)
why do we have to risk it so soon?

Or have I misunderstood?

asturm · Developer Joined: 05 Apr 2007 Posts: 8938

The news doesn't tell you to risk it at this point. That said, 3.8 is gone on most of my systems.

NeddySeagoon · Posted: Thu May 06, 2021 5:51 pm Post subject:

transsib,

Good to speak with you again too :)

I thought what was announced was a statement of intent rather than a you need to do this now.
I've been doing a full rebuild for gcc-11.1 and I said don't be first :) so I've not synched for a week, so I could be out of date with portage news items.

My gcc-11.1 rebuild is on a system I can afford to abandon if it goes badly.
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EasterParade · l33t Joined: 26 Jul 2003 Posts: 938

Ok, I misunderstood again.

NeddySeagoon · Posted: Thu May 06, 2021 5:55 pm Post subject:

transsib,

That's correct. PYTHON_TARGETS and PYTHON_SINGLE_TARGET are set in your profile
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Hu · Administrator Joined: 06 Mar 2007 Posts: 21725

EasterParade · l33t Joined: 26 Jul 2003 Posts: 938

Ok, NeddySeagoon and Hu, I pass, meaning I will sit on my hands and do nothing.
I will trust my system to know best what´s gonna happen.
Or I boot into Windows on June 1st and wait until ... until the storm has passed
or Gentoo is ready to embrace python 3.9

NeddySeagoon · Posted: Thu May 06, 2021 6:19 pm Post subject:

transsib,

Gentoo is close to being ready. As always there are a few stragglers.
I'll try it on something expendable before I do it on a must have system.

There will be a lot of rebuilding. If that won't matter, do nothing.
If you want to control the date of the update, set PYTHON_TARGETS and PYTHON_SINGLE_TARGET is make.conf to either delay it it bring it forward.
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Computer users fall into two groups:-
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those that have never had a hard drive fail.

EasterParade · l33t Joined: 26 Jul 2003 Posts: 938

Thank you, Neddy, good call.
Have a nice evening, or rest of the day.

asturm · Developer Joined: 05 Apr 2007 Posts: 8938

EasterParade · l33t Joined: 26 Jul 2003 Posts: 938

Will do asturm; already asked myself that question about the make.conf.
But "deferring the update" also doesn´t explicitly tell where to set

hjkl · Posted: Thu May 06, 2021 8:56 pm Post subject:

asturm · Developer Joined: 05 Apr 2007 Posts: 8938

Guys, read that stuff. A few people spend valuable time on it. Also right there:

hjkl · Posted: Fri May 07, 2021 6:04 am Post subject:

EasterParade · l33t Joined: 26 Jul 2003 Posts: 938

fullbyte wrote:

asturm · Developer Joined: 05 Apr 2007 Posts: 8938

Don't be all sorry, it's fine, I just have to point out obvious misreadings of the news.

Take your time and don't panic, the default switch is a few weeks away, and there's nothing scary about a python target upgrade.

alamahant · Advocate Joined: 23 Mar 2019 Posts: 3879

hjkl · Posted: Fri May 07, 2021 12:12 pm Post subject:

CaptainBlood · Advocate Joined: 24 Jan 2010 Posts: 3638

Applying the first of the three steps described for 3_7 to 3_8 migration the following amd64 stable packages don't take the new python3_8 PYTHON_TARGETS into account: