title: How to sort alphanumeric list in python
body: <p>I have a list as </p>
  
  <pre><code>a = [["1", "ok", "na"], ["15", "asd", "asdasd"], ["100", "uhu", "plo"], ["10", "iju", "tlo"], ["ISC_1", "des", "det"], ["12", "asd", "assrg"], ["ARF", "asd", "rf"]]
  </code></pre>
  
  <p>I want this list to be sorted as below:</p>
  
  <pre><code>[['1', 'ok', 'na'], ['10', 'iju', 'tlo'], ['12', 'asd', 'assrg'], ['15', 'asd', 'asdasd'], ['100', 'uhu', 'plo'], ['ARF', 'asd', 'rf'], ['ISC_1', 'des', 'det']]
  </code></pre>
  
  <p>I have used a.sort()</p>
  
  <p>It is resulting as below:</p>
  
  <pre><code>[['1', 'ok', 'na'], ['10', 'iju', 'tlo'], ['100', 'uhu', 'plo'], ['12', 'asd', 'assrg'], ['15', 'asd', 'asdasd'], ['ARF', 'asd', 'rf'], ['ISC_1', 'des', 'det']]
  </code></pre>
  
  <p>Please help me how to sort in this case.</p>