Re: [gentoo-user] Q: What is "python-exec2c"? Why would "python3" dispatched through it not see an installed copy of pyyaml?

[Steven Lembark <lembark@wrkhors.com>]

On Sun, 7 Mar 2021 22:04:39 +0000
Neil Bothwick <neil@digimed.co.uk> wrote:

> But you have chosen a different default version of Python. That leaves
> you two choices:
> 
> 1) use eselect to set your default python to 3.8
> 2) Add python_39 to PYTHON_TARGETS
> 3) Explicitly call python38 in the shebang line of the affected
> script. 

So, I go back and eselect 3.8.
I then try to perform some basic maintainence which fails for
lack of a python module I think is installed for python 3.8.

Q: Is there no way to have a consistent version of Python on 
   the system?

    # eselect python list;
    Available Python interpreters, in order of preference:
      [1]   python3.8
      [2]   python3.6
      [3]   python3.9
      [4]   python3.7 (fallback)
      [5]   python2.7 (fallback)


    # emerge dev-python/chardet;

    <snip>

    writing byte-compilation script '/tmp/portage/dev-python/chardet-4.0.0/temp/tmp591yrh90.py'
 *  /usr/bin/python3.8 /tmp/portage/dev-python/chardet-4.0.0/temp/tmp591yrh90.py
    removing /tmp/portage/dev-python/chardet-4.0.0/temp/tmp591yrh90.py
    writing byte-compilation script '/tmp/portage/dev-python/chardet-4.0.0/temp/tmp9vcif_en.py'
 *  /usr/bin/python3.8 /tmp/portage/dev-python/chardet-4.0.0/temp/tmp9vcif_en.py
    removing /tmp/portage/dev-python/chardet-4.0.0/temp/tmp9vcif_en.py

    <snip>

    >>> Installing (1 of 1) dev-python/chardet-4.0.0::gentoo
    >>> Auto-cleaning packages...

    >>> No outdated packages were found on your system.

     * GNU info directory index is up-to-date.

    !!! existing preserved libs:
    >>> package: dev-libs/icu-68.2
     *  - /usr/lib64/libicudata.so.67
     *  - /usr/lib64/libicudata.so.67.1
     *  - /usr/lib64/libicui18n.so.67
     *  - /usr/lib64/libicui18n.so.67.1
     *      used by /usr/bin/js60 (dev-lang/spidermonkey-60.5.2_p0-r4)
     *      used by /usr/lib64/libmozjs-60.so (dev-lang/spidermonkey-60.5.2_p0-r4)
     *  - /usr/lib64/libicuuc.so.67
     *  - /usr/lib64/libicuuc.so.67.1
     *      used by /usr/bin/js60 (dev-lang/spidermonkey-60.5.2_p0-r4)
     *      used by /usr/lib64/libmozjs-60.so (dev-lang/spidermonkey-60.5.2_p0-r4)
    Use emerge @preserved-rebuild to rebuild packages using these libraries


 *  python3_8: running distutils-r1_run_phase distutils-r1_python_install_all


    # $emerge @preserved-rebuild

    These are the packages that would be merged, in order:

    Calculating dependencies... done!

 *  emerge: there are no ebuilds to satisfy ">=dev-python/chardet-3.0.2[python_targets_python3_6(-),python_targets_python3_7(-),python_targets_python3_8(-),-python_single_target_pypy3(-),-python_single_target_python3_6(-),-python_single_target_python3_7(-),-python_single_target_python3_8(-),-python_single_target_python3_9(-)]".
    <snip>

    # emerge --search dev-python/chardet;
      
    [ Results for search key : dev-python/chardet ]
    Searching...

    *  dev-python/chardet
          Latest version available: 4.0.0
          Latest version installed: 4.0.0



    # emerge --info dev-python/chardet; 
 *  Portage 3.0.13 (python 3.8.7-final-0, default/linux/amd64/17.1, gcc-9.3.0, glibc-2.32-r3, 5.9.1-gentoo-af x86_64)
 *  dev-lang/python:          2.7.18-r6::gentoo, 3.6.12-r2::gentoo, 3.7.9-r2::gentoo, 3.8.7-r1::gentoo, 3.9.1-r1::gentoo
 *  USE="-test" ABI_X86="(64)" PYTHON_TARGETS="python3_7 python3_8 (-pypy3) -python3_9"


See <https://pastebin.com/JbKXEptz> for details of --info.

-- 
Steven Lembark
Workhorse Computing
lembark@wrkhors.com
+1 888 359 3508