How to create a Python virtual environment.
On Windows
$ pip install venv
$ python3 -m venv ~/python-test
On Ubuntu
$ sudo apt install python3.8-venv
$ python3 -m venv ~/python-test
On Mac OS
$ brew install virtualenv
$ virtualenv python-test
Activate
$ cd ~/python-test
$ source bin/activate
Deactivate
$ deactivate