pyenv
https://realpython.com/intro-to-pyenv/

- Installation
  `$ curl https://pyenv.run | bash`
- Confirguration
 Adding following in `~/.bashrc`
	 ```
	 export PATH="$HOME/.pyenv/bin:$PATH"
	 eval "$(pyenv init -)"
	 eval "$(pyenv virtualenv-init -)"
	```
	 
- Use
  `$ pyenv install --list | grep " 3\.[678]"`
  To install desired one
  `pyenv install -v 3.7.2`
  List versions
  `pyenv versions`
- Switching versions
  `pyenv global 2.7.15`