title: Conditional test within pandas dataframe
body: <p>Can someone help me with a pandas question?  I have a timeseries dataframe such as this: </p>
  
  <pre><code>                       GOOG     AAPL
  2010-12-09 16:00:00    591.50   551
  2010-12-10 16:00:00    592.21   523
  2010-12-13 16:00:00    594.62   578
  2010-12-14 16:00:00    594.91   567
  2010-12-15 16:00:00    590.30   577
  ...
  </code></pre>
  
  <p>I need to loop through each timestamp and test whether AAPL is > 570.  If it is, then I want to print the date and the price of AAPL for that entry.  Is this possible?</p>