Sorting a list which has numbers in the form of string in python : <p>I have list of numbers which is in the form of string and I want to sort the numbers in it. How do I sort such numbers in python?</p>

<p>Here is my list.</p>

<pre><code>key_s=['115', '114', '117', '116', '111', '110', '113', '112', '68', '119', '118', '44', '45', '42', '43', '41', '76', '108', '109', '71', '107', '79', '13', '15', '14', '17', '16', '37']
</code></pre>

<p>I tried using <code>key_s.sort()</code>.It returns <code>None</code> instead of sorted array. I even tried <code>sorted(key_s)</code> which is even not working. So what is the solution to sort it?</p>
