Python 3.8 with venv on Ubuntu 18.04

sudo apt update
sudo apt install software-properties-common
sudo add-apt-repository ppa:deadsnakes/ppa
sudo apt install python3.8 python3.8-venv
python3.8 -m venv venv8
source venv8/bin/activate
pip install -U pip
pip install ipython
ipython
# using ipython or python for development
# to quit python 3.8 virtual environment
deactivate