title: Convert pandas DataFrame into list of lists
body: <p>I have a pandas data frame like this:  </p>
  
  <pre><code>admit   gpa  gre  rank   
  0  3.61  380     3  
  1  3.67  660     3  
  1  3.19  640     4  
  0  2.93  520     4
  </code></pre>
  
  <p>Now I want to get a list of rows in pandas like:  </p>
  
  <pre><code>[[0,3.61,380,3], [1,3.67,660,3], [1,3.19,640,4], [0,2.93,520,4]]   
  </code></pre>
  
  <p>How can I do it?</p>