title: Virtualenv requirement already satisfied
body: <p>I'm trying to use the simple command <code>virtualenv .</code>, but it says virtualenv does not exist. However, when I try <code>pip install virtualenv</code> or <code>sudo pip install virtualenv</code>, it says the "Requirement already satisfied". I've tried uninstalling and reinstalling multiple times, to no avail.</p>
  
  <p>Any help would be appreciated, thanks.</p>