title: Truncating all values in a column pandas
body: <p>I am attempting to truncate column values in pandas after dividing by a number. Here are the two methods I have tried:</p>
  
  <p><code>df['new'] = int('%.0f'%(df['old']/12))</code></p>
  
  <p><code>df['new'] = int(df['old']/12)</code></p>
  
  <p>Each time I get type errors: </p>
  
  <pre><code>cannot convert the series to &lt;class 'float'&gt;
  cannot convert the series to &lt;class 'int'&gt;
  </code></pre>
  
  <p>How can I solve this problem while avoiding these errors?</p>