title: Converting Float to Int on certain columns in a data frame
body: <p>I am trying to convert columns 0 to 4 and 6 to ints from there current float types.</p>
  
  <p>I tried:</p>
  
  <pre><code>df[0:4,6].astype(int)
  </code></pre>
  
  <p>but of course this does not work...</p>