Install prerequisites and pyenv:

sudo apt install -y make build-essential libssl-dev zlib1g-dev  libbz2-dev libreadline-dev libsqlite3-dev wget curl llvm libncurses5-dev libncursesw5-dev xz-utils tk-dev libffi-dev liblzma-dev python-openssl

curl https://pyenv.run | bash

Prepare the startup files by following the output instructions.

Install a specific python version:

pyenv install --list | grep " 3\.[678]"
pyenv install -v <version>
pyenv global/local/shell <version>

Delete a specific version:

pyenv uninstall <version>

Install a virtual environment:

pyenv virtualenv <python_version> <environment_name>

For more information please read: https://realpython.com/intro-to-pyenv/