https://www.linuxtut.com/en/e883e562fb7fddcfeec9/

1. Installing Pyenv is typically done via running the following script:

curl https://pyenv.run | bash

2. Shell Setup

Pyenv requires you to run the following code in the shell prior to usage. This can be run via the .bashrc file at the initialization of the shell.

export PATH="$HOME/.pyenv/bin:$PATH"
eval "$(pyenv init -)"
eval "$(pyenv virtualenv-init -)"

Next, we will run the install argument with a version, this will install on the system of Python version we requested. Show available list of python version to install:

pyenv install -l

Insall a specific version:

pyenv install 3.9.2

To see all the installed versions, just run:

pyenv versions

Set as the global python version running:

pyenv global 3.8.8

Check your global version, just run:

python -V

To set a local version, go to the project folder in the terminal:

cd ~/path/to/the/project/folder

And set the local version, for example, 3.9.1:

pyenv local 3.9.1

To uninstall an already installed Python version.

pyenv uninstall <Python version>

For using pipevn follow this link: https://www.singlestoneconsulting.com/blog/setting-up-your-python-environment

Reference:

1. https://www.rootstrap.com/blog/how-to-manage-your-python-projects-with-pipenv-pyenv