Declaring an empty list
<p>I just noticed that declaring two empty lists as:</p>

<pre><code>list1 = list2 = []
</code></pre>

<p>produced an entirely different result as compared to:</p>

<pre><code>list1 = []
list2 = []
</code></pre>

<p>I don't this problem is related to the whole program as such, or that the result is important. Nevertheless here is <a href="http://pastebin.com/bYJ82T96" rel="nofollow">the whole program</a>. So is there any difference between the two ways of declaration?</p>
