pip3 install virtualenv --user
Follow the guide here: https://docs.python-guide.org/dev/virtualenvs/#virtualenvironments-ref.
You can name your virtual environment oci or chaostk or another name of your preference e.g. :
virtualenv ~/.venvs/chaostk
Activate the environment on Linux/macOS:
source ~/.venvs/chaostk/bin/activate
Activate the environment on Windows:
source ~/.venvs/chaostk/Scripts/activate