title: How to call set_index() on DataFrame?
body: <p>My code requires the use of <code>set_index</code>. </p>
  
  <p>I import:</p>
  
  <pre><code>    import sys
      import io  
      import csv   
      import math   
      from pandas import *   
      import numpy as np
  </code></pre>
  
  <p>I assumed that this would suffice. It doesn't, since I receive a :</p>
  
  <p>NameError: name <code>set_index</code> is not defined. </p>
  
  <p>I am using iPython EPDFree and pandas from PyPI (Riverbank computing). Is there a module I'm overlooking?</p>