title: How to set PYTHONPATH to multiple folders
body: <p>In <code>~/.bash_profile</code> file (OS X) I've set PYTHONPATH to point to two folders:</p>
  
  <pre><code>export PYTHONPATH=/Applications/python/common:$PYTHONPATH
  export PYTHONPATH=/Applications/sitecustomize:$PYTHONPATH
  </code></pre>
  
  <p>Even while <code>sitecustomize</code> folder is set on a second line (after <code>/common</code>) 
  the first path is ignored and I am not able to import any module from the path defined in a first line. What needs to be revised in above syntax to make both folders PYTHONPATHish to Python?</p>