Get pip and virtualenv into your system Python if they aren't already. This will also create a virtualenv as an example at $APP_Path.

pip-virtualenv.sh

#!/bin/bash

APP_PATH=$HOME/app
PYTHON_KERNEL=$APP_PATH/venv/bin/python

function install_pip {
    echo -e 'downloading pip...'
    curl -SLO https://bootstrap.pypa.io/get-pip.py 
    echo -e 'installing pip...'
    python get-pip.py
    if [[ -e /usr/local/bin/pip ]]; then
        echo -e 'pip successfully installed'
        rm get-pip.py
    else
        echo -e 'install failed'
    fi
}

function install_virtualenv {
    echo -e 'installing virutalenv...'
    echo -e '>> Need sudo to install into system pip! <<'
    sudo pip install virtualenv
    if [[ -e /usr/local/bin/virtualenv ]]; then
        echo -e 'virtualenv successfully installed'
    else
        echo -e 'install failed'
    fi
}

function check_pip {
    if ! [[ $(which pip) ]]; then
        install_pip
    else
        echo -e 'pip is installed.'
    fi
}

function check_virtualenv {
    if ! [[ -e /usr/local/bin/virtualenv ]]; then
        echo -e 'virtualenv is missing.'
        install_virtualenv
    else
        echo -e 'virtualenv is installed.'
    fi
}

function create_app_virtualenv {
    virtualenv $APP_PATH/venv
}

function virtualenv_demo {
    $PYTHON_KERNEL -c 'print("Howdy!")'
}

function main {
    check_pip
    check_virtualenv
    create_app_virtualenv
    echo -e 'now just point the new kernel >>' $PYTHON_KERNEL '<< at an executable.'
    echo -e 'Here is an example:\n\n'
    virtualenv_demo
}

main