Domoticz

I installed a Pi4 from scratch:
Raspberry Pi Imager v1.8.5
Model: Raspberry Pi4
OS: Raspberry Pi OS (other) > Raspberry Pi OS Lite (64-bit) (Debian Bookworm)

I installed 3 docker containers: domoticz, mqtt5 and zwavejs-ui each in a container.
Imported the domoticz sqlite db from my previous Pi3B; my 5+ years of historical data is there. Top!
System runs like a charm.

Now I'm set for Python plugins .. or not?

Python version in Domoticz > About:

Python Version: 3.9.2 (default, Feb 28 2021, 17:03:44) [GCC 10.2.1 20210110]

and, at the command line:

rpi4@raspi4:~ $ python3 --version
Python 3.11.2

So what is it? 3.9.2 or 3.11.2?

So I took the steps from:
https://www.domoticz.com/wiki/Using_Python_plugins

rpi4@raspi4:~ $ sudo apt install python3
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
python3 is already the newest version (3.11.2-1+b1).
python3 set to manually installed.
0 upgraded, 0 newly installed, 0 to remove and 12 not upgraded.

OK

rpi4@raspi4:~ $ dpkg --get-selections | grep libpython
libpython3-stdlib:arm64 install
libpython3.11:arm64 install
libpython3.11-minimal:arm64 install
libpython3.11-stdlib:arm64 install

So libpython3.11 is there; no need to install

rpi4@raspi4:~ $ sudo apt install python3-dev
....
The following NEW packages will be installed:
javascript-common libexpat1-dev libjs-jquery libjs-sphinxdoc libjs-underscore libpython3-dev libpython3.11-dev
python3-dev python3.11-dev zlib1g-dev
0 upgraded, 10 newly installed, 0 to remove and 12 not upgraded.
....

Again check libpython:

rpi4@raspi4:~ $ dpkg --get-selections | grep libpython
libpython3-dev:arm64 install
libpython3-stdlib:arm64 install
libpython3.11:arm64 install
libpython3.11-dev:arm64 install
libpython3.11-minimal:arm64 install
libpython3.11-stdlib:arm64 install

So libpython3-dev:arm64 is installed now
So far, so good
Reboot, just to make sure.

Check the Python3 versions: still the same:
Domoticz > About: 3.9.2
Command Line: 3.11.2

So what now?
Ignore this discrepancy and go ahead with python plugins?
I don't think I can google myself out of this.
Any suggestions?

Oh, by the way: there is no other version than version 3.11 of Python present:

rpi4@raspi4:~ $ ls -al /usr/bin/python*
lrwxrwxrwx 1 root root 7 Jan 8 2023 /usr/bin/python -> python3
lrwxrwxrwx 1 root root 10 Apr 9 2023 /usr/bin/python3 -> python3.11
-rwxr-xr-x 1 root root 6618352 Mar 13 2023 /usr/bin/python3.11
lrwxrwxrwx 1 root root 35 Mar 13 2023 /usr/bin/python3.11-config -> aarch64-linux-gnu-python3.11-config
lrwxrwxrwx 1 root root 17 Apr 9 2023 /usr/bin/python3-config -> python3.11-config

Just found the answer. Topic:
https://www.domoticz.com/forum/viewtopic.php?t=40072
rerers back to the Domoticz in Docker wiki page
The Domoticz Docker container runs Python 3.9.2
So may I conclude then that for Python plugins in Domoticz the Python version on the command line doesn't matter?

When Domoticz runs in a Docker container it relies on the python version in the docker container.