title: Python module not showing up in sys.modules
body: <p>I have installed some packages by unpackaging the tar.gz and running setup.py.</p>
  
  <p>I am checking by</p>
  
  <pre><code>&gt;&gt;&gt; import sys
  &gt;&gt;&gt; '[packagename]' in sys.modules
  </code></pre>
  
  <p>but it keeps saying <code>False</code>, for all of them. What am I missing?</p>