Why does [].append() not work in python?
<p>Why does this work - </p>

<pre><code>a = []
a.append(4)
print a
</code></pre>

<p>But this does not - </p>

<pre><code>print [].append(4)
</code></pre>

<p>The output in second case is <code>None</code>. Can you explain the output?</p>
