It enables us to use multiple python versions on the same machine without making it a mess.

Each python version can have multiple virtual environments in it

Install
curl https://pyenv.run | bash

Load
Load pyenv automatically by adding the following to ~/.bashrc:

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

Check available python version
pyenv install --list | grep " 3\.[678]"

Install python version
pyenv install -v py_version

Create virtual environment
pyenv virtualenv 3.8.9 py_version

Activate virtual environment
pyenv activate env_name

Set local environment for specific directory
pyenv local env_name

Useful commands

1. pyenv versions

2. ls ~/.pyenv/versions/

3. rm -rf ~/.pyenv/versions/2.7.15  OR pyenv uninstall 2.7.15

4. pip install --use-feature=2020-resolver -r pip-requirements.txt