title: no module named gtk
body: <p>Why I install gtk &amp; pygtk with homebrew, but python still not able to find it:</p>
  
  <pre><code>brew test -v pygtk
  Testing pygtk
  ==&gt; chmod +x test.py
  chmod +x test.py 
  ==&gt; ./test.py
  ./test.py 
  Traceback (most recent call last):
    File "./test.py", line 2, in &lt;module&gt;
      import pygtk
  ImportError: No module named pygtk
  Error: pygtk: failed
  </code></pre>