title: Lambda expression not returning value
body: <p>I don't understand why does this code return repr of object instead of value 20.</p>
  
  <pre><code>&gt;&gt;&gt; a = 10
  &gt;&gt;&gt; lambda a: a*2
  </code></pre>
  
  <p>This is what is returned to standard output:</p>
  
  <pre><code>&lt;function &lt;lambda&gt; at 0x02D93780&gt;
  </code></pre>