title: Install virtualenvwrapper for Python 2.7 and 3.6 simultaneously
body: <p>How does one install <code>virtualenvwrapper</code> for both <code>Python 2.7</code> and <code>3.6</code> versions? My default Python environment is <code>Python 3.6</code> and as such <code>virtualenvwrapper</code> is installed for <code>Python 3.6</code> and not <code>2.7</code>. I'm using <code>macOS Sierra 10.12.6</code>.</p>