# Linux and Mac only (at the moment)

curl https://pyenv.run | bash

# Powershell administrator

Invoke-WebRequest -UseBasicParsing -Uri "https://raw.githubusercontent.com/pyenv-win/pyenv-win/master/pyenv-win/install-pyenv-win.ps1" -OutFile "./install-pyenv-win.ps1"; &"./install-pyenv-win.ps1"

pyenv install 3.7.8

pyenv global 3.7.8

​

pyenv install --list | awk '{print $1}' | grep -v - | grep -v 'a\|b\|c\|m' | tail -1

pyenv exec pip install numpy

or 

pyenv exec pip --version

Python 3.5:

pyenv install 3.5.4

Python 3.6:

pyenv install 3.6.8 

Python 3.7:

pyenv install 3.7.9

Python 3.8:

pyenv install 3.8.6

Python 3.9:

pyenv install 3.9.0

You can use below link to install pyenv