title: How do I convert all strings in a list of lists to integers?
body: <p>I have a tuple of tuples containing strings:</p>
  <pre><code>T1 = (('13', '17', '18', '21', '32'),
        ('07', '11', '13', '14', '28'),
        ('01', '05', '06', '08', '15', '16'))
  </code></pre>
  <p>I want to convert all the string elements into integers and put them back into a list of lists:</p>
  <pre><code>T2 = [[13, 17, 18, 21, 32],
        [7, 11, 13, 14, 28],
        [1, 5, 6, 8, 15, 16]]
  </code></pre>
  <p><strong>Related:</strong></p>
  <ul>
  <li><a href="https://stackoverflow.com/questions/379906/how-do-i-parse-a-string-to-a-float-or-int">Convert <code>str -&gt; int</code></a></li>
  <li><a href="https://stackoverflow.com/q/7368789/365102">Convert <code>list[str] -&gt; list[int]</code></a></li>
  </ul>