How do I sort this list in Python 3? : <p>I'm in the middle of making a leaderboard, currently I am taking data from a txt file and dumping it into a list.</p>

<p>The list's format looks something like this:</p>

<p><code>[['56', 'UsernameA'], ['73', 'UsernameB'], ['52', 'UsernameC'], ['10', 'UsernameD']]</code></p>

<p>I would like to create a leaderboard, therefore I would like to sort the list from the highest number to the lowest, I've tried using the <code>sort()</code> function, however this only works on integers and my list contains the username and the score, so I cannot convert it into an integer, unless I'm completely wrong here.</p>
