title: Change default Python version from 2.4 to 2.6
body: <p>I'm wanting to use some newer software that requires Python <code>2.6</code>, and we currently have both <code>2.4</code> and <code>2.6</code> installed on our dedicated CentOS server, which looks like this:</p>
  
  <pre><code>$ which python
  /usr/local/bin/python
  $ which python2.6
  /usr/bin/python2.6
  $ which python2.4
  /usr/local/bin/python2.4
  $ ls -l /usr/local/bin/py*
  -rwxr-xr-x 1 root root      81 Aug  9  2007 /usr/local/bin/pydoc
  -rwxr-xr-x 2 root root 3394082 Aug  9  2007 /usr/local/bin/python
  -rwxr-xr-x 2 root root 3394082 Aug  9  2007 /usr/local/bin/python2.4
  </code></pre>
  
  <p>How can I switch it to start using <code>2.6</code> as the default <code>python</code>?</p>