title: changing sort in value_counts
body: <p>If I do </p>
  
  <pre><code>mt = mobile.PattLen.value_counts()   # sort True by default
  </code></pre>
  
  <p>I get</p>
  
  <pre><code>4    2831
  3    2555 
  5    1561
  [...]
  </code></pre>
  
  <p>If I do</p>
  
  <pre><code>mt = mobile.PattLen.value_counts(sort=False) 
  </code></pre>
  
  <p>I get</p>
  
  <pre><code>8    225
  9    120
  2   1234 
  [...]
  </code></pre>
  
  <p>What I am trying to do is get the output in 2, 3, 4 ascending order (the left numeric column).  Can I change value_counts somehow or do I need to use a different function. </p>