Python 3.6 がインストールされている環境（Rocky8.10）に Python 3.11 を追加でインストールしたので、手順を備忘録として残します。
※ここでは実際に設定、動作したものを掲載していますが、内容について保証するものではありません。流用される場合は各自の責任でお願いします。
インストール前の環境情報
# uname -a
Linux polardns 4.18.0-372.9.1.el8.x86_64 #1 SMP Tue May 10 14:48:47 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
# cat /etc/redhat-release
Rocky Linux release 8.10 (Green Obsidian)
# python3 -V
Python 3.6.8インストール
1. python3.11の情報を確認。
# dnf info python3.11
Last metadata expiration check: 0:01:05 ago on Sat Oct 19 13:36:19 2024.
Available Packages
Name : python3.11
Version : 3.11.9
Release : 7.el8_10
Architecture : x86_64
Size : 30 k
Source : python3.11-3.11.9-7.el8_10.src.rpm
Repository : appstream
Summary : Version 3.11 of the Python interpreter
URL : https://www.python.org/
License : Python
Description : Python 3.11 is an accessible, high-level, dynamically typed, interpreted
…2. python3.11をインストール。
# dnf install python3.11 -y
…
Installed:
mpdecimal-2.5.1-3.el8.x86_64 python3.11-3.11.9-7.el8_10.x86_64 python3.11-libs-3.11.9-7.el8_10.x86_64
python3.11-pip-wheel-22.3.1-5.el8.noarch python3.11-setuptools-wheel-65.5.1-3.el8_10.noarch
Complete!3. デフォルトで使用される python のバージョンを確認する。（→ 3.6）
# update-alternatives --display python3
python3 - status is auto.
link currently points to /usr/bin/python3.6
/usr/bin/python3.6 - priority 1000000
slave easy_install-3: /usr/bin/easy_install-3.6
slave pip-3: /usr/bin/pip-3.6
slave pip3: /usr/bin/pip3.6
slave pydoc-3: /usr/bin/pydoc3.6
slave pydoc3: /usr/bin/pydoc3.6
slave pyvenv-3: /usr/bin/pyvenv-3.6
slave python3-man: /usr/share/man/man1/python3.6.1.gz
/usr/bin/python3.11 - priority 31100
slave easy_install-3: (null)
slave pip-3: (null)
slave pip3: (null)
slave pydoc-3: /usr/bin/pydoc3.11
slave pydoc3: /usr/bin/pydoc3.11
slave pyvenv-3: (null)
slave python3-man: /usr/share/man/man1/python3.11.1.gz
Current `best' version is /usr/bin/python3.6.4. python3.11に切り替え。
# update-alternatives --config python3
There are 2 programs which provide 'python3'.
Selection Command
-----------------------------------------------
*+ 1 /usr/bin/python3.6
2 /usr/bin/python3.11
Enter to keep the current selection[+], or type selection number: 25. 切り替わったことを確認。
# python3 -V
Python 3.11.96. python3.11用のpipをインストール。
# dnf install python3.11-pip -y
…
Installed:
python3.11-pip-22.3.1-5.el8.noarch python3.11-setuptools-65.5.1-3.el8_10.noarch
Complete!7. pipを最新化しておく。
# python3 -m pip install pip --upgrade
Requirement already satisfied: pip in /usr/lib/python3.11/site-packages (22.3.1)
Collecting pip
Downloading pip-24.3.1-py3-none-any.whl (1.8 MB)
---------------------------------------- 1.8/1.8 MB 12.6 MB/s eta 0:00:00
Installing collected packages: pip
Successfully installed pip-24.3.1
WARNING: Running pip as the 'root' user can result in broken permissions and conflicting behaviour with the system package manager. It is recommended to use a virtual environment instead: https://pip.pypa.io/warnings/venv
# pip3 -V
pip 24.3.1 from /usr/local/lib/python3.11/site-packages/pip (python 3.11)8. 念のため現在のカレントが python3.11 であることを確認。
# update-alternatives --display python3
python3 - status is manual.
link currently points to /usr/bin/python3.11
/usr/bin/python3.6 - priority 1000000
slave easy_install-3: /usr/bin/easy_install-3.6
slave pip-3: /usr/bin/pip-3.6
slave pip3: /usr/bin/pip3.6
slave pydoc-3: /usr/bin/pydoc3.6
slave pydoc3: /usr/bin/pydoc3.6
slave pyvenv-3: /usr/bin/pyvenv-3.6
slave python3-man: /usr/share/man/man1/python3.6.1.gz
/usr/bin/python3.11 - priority 31100
slave easy_install-3: (null)
slave pip-3: /usr/bin/pip-3.11
slave pip3: /usr/bin/pip3.11
slave pydoc-3: /usr/bin/pydoc3.11
slave pydoc3: /usr/bin/pydoc3.11
slave pyvenv-3: (null)
slave python3-man: /usr/share/man/man1/python3.11.1.gz
Current `best' version is /usr/bin/python3.6.