Append item to every list in list of list
<p>I am looking to append item to every list in a list of list.</p>

<p>I had expected the following code to work:</p>

<pre><code>start_list = [["a", "b"], ["c", "d"]]

end_list = [item.append("test") for item in start_list]
</code></pre>

<p>with expected output <code>[["a", "b", "test"], ["c", "d", "test"]]</code></p>

<p>instead i get <code>[None, None]</code></p>

<p>First, why does this occur, and second, how do i achieve the desired output?</p>