title: Installed virtualenv, but still getting "ModuleNotFoundError: No module named 'virtualenv'" error
body: <p>I'm using CentOS 7 and want to run a "virtualenv" command.  So I tried uninstalling and re-installing it ...</p>
  
  <pre><code>[myuser@server ~]$ sudo pip uninstall virtualenv
  DEPRECATION: Python 2.7 will reach the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 won't be maintained after that date. A future version of pip will drop support for Python 2.7.
  Cannot uninstall 'virtualenv'. It is a distutils installed project and thus we cannot accurately determine which files belong to it which would lead to only a partial uninstall.
  [myuser@server ~]$ sudo pip install virtualenv
  DEPRECATION: Python 2.7 will reach the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 won't be maintained after that date. A future version of pip will drop support for Python 2.7.
  Requirement already satisfied: virtualenv in /usr/lib/python2.7/site-packages (15.1.0)
  </code></pre>
  
  <p>but when I go to actually run it, I'm told its not installed.</p>
  
  <pre><code>[myuser@server ~]$ virtualenv myenv
  Traceback (most recent call last):
    File "/usr/bin/virtualenv", line 2, in &lt;module&gt;
      import virtualenv
  ModuleNotFoundError: No module named 'virtualenv'
  </code></pre>
  
  <p>WTF??</p>