Python switch order of elements
<p>I am a newbie and seeking for the Zen of Python :)  Today's koan was finding the most Pythonesq way to solve the following problem:</p>

<blockquote>
  <p>Permute the letters of a string pairwise, e.g.</p>

<pre><code>input:  'abcdefgh'
output: 'badcfehg'
</code></pre>
</blockquote>
