Debian 11 Bullseye
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Python 3.9 : Install2021/09/22

 
Install Python.
[1] Install Python 3.9.
root@dlp:~#
apt -y install python3.9
root@dlp:~#
python3 -V

Python 3.9.2
# verify to run test script

root@dlp:~#
echo -e "import sys\nprint(sys.version)" > python3_test.py

root@dlp:~#
python3 python3_test.py

3.9.2 (default, Feb 28 2021, 17:03:44)
[GCC 10.2.1 20210110]
[2] If you'd like to use [python3] command as a [python] command, configure like follows.
root@dlp:~#
which python3

/usr/bin/python3
root@dlp:~#
ll /usr/bin/python3*

lrwxrwxrwx 1 root root       9 Apr  5 21:00 /usr/bin/python3 -> python3.9
-rwxr-xr-x 1 root root 5479736 Mar  1  2021 /usr/bin/python3.9

root@dlp:~#
update-alternatives --install /usr/bin/python python /usr/bin/python3.9 1

update-alternatives: using /usr/bin/python3.9 to provide /usr/bin/python (python) in auto mode
root@dlp:~#
ll /usr/bin/python

lrwxrwxrwx 1 root root 24 Sep 21 19:17 /usr/bin/python -> /etc/alternatives/python

root@dlp:~#
python -V

Python 3.9.2
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