Can't understand the reason for an output in Python
<p>I've just started learning Python. I came across following code</p>

<blockquote>
  <p><code>if 0:</code></p>

<pre><code>  print "And now for something completely different..."
</code></pre>
  
  <p><code>else:</code></p>

<pre><code>  print "What's all this, then?"
</code></pre>
</blockquote>

<p>I understand that output should be <code>What's all this, then?</code> but I can't seem to find a proper explanation for that. Hope someone can make me understand that.</p>

<p>Thanks.</p>
