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Managing Multiple Versions of Python on Ubuntu 20

https://hackersandslackers.com/multiple-python-versions-ubuntu-20-04/

Python Installation​

sudo add-apt-repository ppa:deadsnakes/ppa
sudo apt update
sudo apt install python3.10

Manage Alternative Python Installations​

Set alternative versions for Python​

update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.8 1
update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.9 2

List installed versions of Python​

update-alternatives --list python3

Swap between versions of Python​

update-alternatives --config python3

Finishing Touches​

sudo apt remove --purge python3-apt
sudo apt autoclean
sudo apt install python3-apt
sudo  apt install python3.10-distutils
sudo apt install curl
curl -sS https://bootstrap.pypa.io/get-pip.py | python3.10
python3.10 -m pip install --upgrade pip
sudo apt install python3.10-venv