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[solved] Current Python Version Selection
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jagdpanther
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Joined: 22 Nov 2003
Posts: 754

PostPosted: Wed Oct 23, 2024 1:35 am    Post subject: [solved] Current Python Version Selection Reply with quote

I know that "eselect python" is the old way to select python versions. Also according to https://wiki.gentoo.org/wiki/Python "eslect python" still is a wrapper to /etc/python-exec/python-exec.conf. The only uncommented lines in my /etc/python-exec/python-exec.conf are:
Code:
python3.12
python3.11


So why is my gentoo system reporting that it will remove python-3.11 when I run "emerge --depclean -p" ?

(I want to keep python-3.11 because I have some 3rd party stuff, stable diffusion, that currently uses python-3.11.)

Where is the documentation for the current proper way to tell Portage to keep a specified version of Python?

Thanks.


Last edited by jagdpanther on Wed Oct 23, 2024 2:45 am; edited 1 time in total
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bstaletic
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PostPosted: Wed Oct 23, 2024 2:30 am    Post subject: Reply with quote

Either your @world does not mention dev-lang/python or it has no version nor slot specification.
Your entire system can be rebuilt with just python 3.12, so portage is fine with trying to remove python 3.11.
python-exec.conf is not in this equation at all.

What you can do is add python 3.11 to your world set. emerge -u python:3.11 should do the trick.
That way, some version of python 3.11 will remain in your @world set.
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jagdpanther
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PostPosted: Wed Oct 23, 2024 2:44 am    Post subject: Reply with quote

bstaletic:

Thank you. Your suggestion fixed the issue.
(And you were correct, I checked /var/lib/portage/world and there were no dev-lang/python:3.x entries.)
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jagdpanther
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PostPosted: Sun Oct 27, 2024 6:01 pm    Post subject: Reply with quote

Quote:
python-exec.conf is not in this equation at all.


I guess I did not read that statement properly: I commented out the two lines in /etc/python-exec/python-exec.conf from my original post. Everything seemed to work fine. Then python3.13 was pushed out via portage but is not the system python. I then tried to run pithos and received:

Code:
Traceback (most recent call last):
  File "/usr/bin/pithos", line 8, in <module>
    from gi.repository import Gio
ModuleNotFoundError: No module named 'gi'


media-sound/pithos-1.6.2 is a python script launched with
Code:
#!/usr/bin/env python3


With all lines commented out in python-exec.conf I get:
Code:
$ eselect python list
Available Python interpreters, in order of preference:
  [1]   python3.13 (fallback)
  [2]   python3.12 (fallback)
  [3]   python3.11 (fallback)


So I changed python-exec.conf to:
Code:
python3.12
python3.13
python3.11


Which fixes the issue and now have:
Code:
$ eselect python list
Available Python interpreters, in order of preference:
  [1]   python3.12
  [2]   python3.13
  [3]   python3.11


Is modifying /etc/python-exec/python-exec.conf the current Gentoo suggested method of choosing which python3 is run by default?
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logrusx
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Joined: 22 Feb 2018
Posts: 2362

PostPosted: Sun Oct 27, 2024 6:16 pm    Post subject: Reply with quote

bstaletic wrote:
emerge -u python:3.11 should do the trick.


emerge --norepalce should have done the trick. There's no need to recompile something that's already there.

Best Regards,
Georgi
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