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FR3141
n00b
Joined: 13 Jan 2018
Posts: 39
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 Posted: Thu Jan 18, 2018 1:04 am Post subject: Which Python Versions are Current? |
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Since most of my programming is done with C, Perl, and Bash, I don't pay much attention to the Python installations on my system. But looking at which Python versions are present I find this:
| Code: | # eselect python list
Available Python interpreters, in order of preference:
[1] python3.6
[2] python2.7
[3] python3.4
[4] python3.5 (fallback)
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Do I need all these Python versions? If not, then which ones should I uninstall?
Portage depends on Python as do many other packages but surely I do not need all these different Python versions.
[Moderator edit: added [code] tags to preserve output layout. -Hu] |
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fedeliallalinea
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Joined: 08 Mar 2003
Posts: 30915
Location: here
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| Posted: Thu Jan 18, 2018 6:52 am Post subject: |
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In a stable system the defaults python target are
| /usr/portage/profiles/base/make.defaults: | ...
# Mike Gilbert <floppym@gentoo.org> (15 May 2012)
# Default target(s) for python-r1.eclass
# Updated to python3_5 on 28 Nov 2017
PYTHON_TARGETS="python2_7 python3_5"
PYTHON_SINGLE_TARGET="python3_5"
... |
then in a default installation you should have python2.7 and python3.5.
But if you have installed python3.4 and python3.6 it means that some package require these, you can investigate with eix
| Code: | $ eix --installed-with-use python_targets_python3_4
$ eix --installed-with-use python_targets_python3_5
$ eix --installed-with-use python_targets_python3_6 |
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Josef.95
Advocate
Joined: 03 Sep 2007
Posts: 4554
Location: Germany
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| Posted: Thu Jan 18, 2018 1:25 pm Post subject: |
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And please have a look on --depclean
--depclean with --verbose shows the reverse dependencies too.
| Code: | | emerge -av --depclean dev-lang/python |
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Ant P.
Watchman
Joined: 18 Apr 2009
Posts: 6920
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| Posted: Fri Jan 19, 2018 2:08 am Post subject: |
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3.4 is obsolete and you can likely dispose of it by updating a few packages.
3.5 is the default and should be there, it's possible to run a 3.6-only system but that requires effort. You probably shouldn't have both those at the same time.
Leave 2.7 alone, you can't get rid of that. |
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Aiken
Apprentice
Joined: 22 Jan 2003
Posts: 239
Location: Toowoomba/Australia
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| Posted: Fri Jan 19, 2018 4:25 am Post subject: |
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Use some other tool to see of those versions of python are installed. I used equery l python
Have found the list of pythons listed by eselect python list is a list of pythons that have been installed at some point and not a list of pythons that are currently installed. It is read from /etc/python-exec/python-exec.conf and it looks like when a python is removed is is not removed from that list. Which makes it confusing.
Not quite game to put money on it but I am finding it easy to think you do not have 3.4 installed. As for 3.5 and 3.6 both have been automatically pulled on as dependencies for me with 3.5 as the main version.
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FR3141
n00b
Joined: 13 Jan 2018
Posts: 39
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| Posted: Sat Jan 20, 2018 3:02 am Post subject: |
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| fedeliallalinea wrote: | In a stable system the defaults python target are
PYTHON_TARGETS="python2_7 python3_5"
PYTHON_SINGLE_TARGET="python3_5"
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I suppose that this was my problem. I had neither of these variables set.
After setting both in make.conf I did "emerge -pv --changed-use world" which rebuilt a few packages that used python versions other than 2_7 and 3_5. Then I unmerged all python versions other than 2_7 and 3_5.
Thanks to all the helpful advice. |
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fedeliallalinea
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Joined: 08 Mar 2003
Posts: 30915
Location: here
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| Posted: Sat Jan 20, 2018 11:27 am Post subject: |
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| FR3141 wrote: | | I suppose that this was my problem. I had neither of these variables set. |
These are provided by profile /usr/portage/profiles/base/make.defaults, try to see with emerge --info
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FR3141
n00b
Joined: 13 Jan 2018
Posts: 39
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| Posted: Sat Jan 20, 2018 3:02 pm Post subject: |
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| fedeliallalinea wrote: | | These are provided by profile /usr/portage/profiles/base/make.defaults |
Yes, I checked make.defaults and those variables are set there, but for some reason other versions of python were still being pulled in.
Anyway, I think I've straightened things out. I'll keep watch over future builds.
Also, how can I keep informed about future changes to the default python installations? Is there a Gentoo web page that tracks python issues? |
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fedeliallalinea
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Joined: 08 Mar 2003
Posts: 30915
Location: here
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| Posted: Sat Jan 20, 2018 4:10 pm Post subject: |
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| FR3141 wrote: | | Also, how can I keep informed about future changes to the default python installations? |
If you use -U option on world update you can see that python_targets change
| FR3141 wrote: | | Is there a Gentoo web page that tracks python issues? |
https://bugs.gentoo.org/
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Hu
Moderator
Joined: 06 Mar 2007
Posts: 21633
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| Posted: Sat Jan 20, 2018 5:23 pm Post subject: |
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| To be clear, if you set those in make.conf, then future changes to those variables in the profile will be ignored in deference of your local setting. This may or may not be what you want, depending on whether you want to support freezing a system with these versions. Most users will not be frozen, and will eventually move on to newer Python versions. I would leave those unset in make.conf. |
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