pyenv - mutliple pythons
curl -L https://raw.githubusercontent.com/pyenv/pyenv-installer/master/bin/pyenv-installer | bash
# maybe put this in your ~/.bashrc...
export PATH="/home/reisinge/.pyenv/bin:$PATH"
eval "$(pyenv init -)"
eval "$(pyenv virtualenv-init -)"
pyenv update
pyenv versions
pyenv install 3.6.3
# if you get errors you might need
sudo apt-get install zlib1g-dev libbz2-dev libreadline-dev libssl-dev
virtualenv - multiple packages
sudo pip3 install virtualenv
mkdir myproject
cd myproject/
virtualenv [--python=/usr/bin/python3.6] myvenv
. myvenv/bin/activate
pyenv local 3.6.3
deactivate