# virtualenv --python=/usr/local/bin/python2.7 <path/to/new/virtualenv/
# virtualenv --python=/usr/local/bin/python3.7 <path/to/new/virtualenv/

set_python_version() {
  while true; do
    echo -n "Please choose Python2 or Python3 (2/3): "
    read python_version
    if [ "$python_version" = "2" ]; then
      echo "Activating: Python 2.7 >> ~/env/bin/activate"
      export PYTHONPATH=/Users/username/env/lib/python2.7/site-packages:/Users/username/git
      source ~/env/bin/activate
      break
    elif [ "$python_version" = "3" ]; then
      echo "Activating: Python 3.7 >> ~/env3/bin/activate"
      export PYTHONPATH=/Users/username/env3/lib/python3.7/site-packages:/Users/username/git
      source ~/env3/bin/activate
      break
    fi
  done
}
set_python_version