title: python and pandas - how to access a column using iterrows
body: <p>wowee.....how to use iterrows with python and pandas?  If I do a row iteration should I not be able to access a col with row['COL_NAME']?</p>
  
  <p>Here are the col names: </p>
  
  <pre><code>print df
  Int64Index: 152 entries, 0 to 151
  Data columns:
  Date          152  non-null values
  Time          152  non-null values
  Time Zone     152  non-null values
  Currency      152  non-null values
  Event         152  non-null values
  Importance    152  non-null values
  Actual        127  non-null values
  Forecast      86  non-null values
  Previous      132  non-null values
  dtypes: object(9)
  
  for row in df.iterrows():
      print row['Date']
  
  Traceback (most recent call last):
    File "/home/ubuntu/workspace/calandar.py", line 34, in &lt;module&gt;
      print row['Date']
  TypeError: tuple indices must be integers, not str
  </code></pre>
  
  <p>if I print 1 row:</p>
  
  <pre><code>(0, Date                                                 Sun Apr 13
  Time                                                      17:30
  Time Zone                                                   GMT
  Currency                                                    USD
  Event         USD Fed's Stein Speaks on Financial Stability ...
  Importance                                                  Low
  Actual                                                      NaN
  Forecast                                                    NaN
  Previous                                                    NaN
  Name: 0)
  </code></pre>