assign references
<p>Is there a way to assign references in python?</p>

<p>For example, in php i can do this:</p>

<pre><code>$a = 10;
$b = &amp;$a;
$a = 20;

echo $a." ".$b; // 20, 20 
</code></pre>

<p>how can i do same thing in python?</p>
