title: Looping through df with 3 columns using iterrows, but getting error that says there are only 2 columns
body: <p>I have a df structured as such:</p>
  
  <pre><code>                T1                  T2                 T3
  14577 2016-01-01 06:55:18 2016-01-01 06:58:00 2016-01-01 07:03:58
  14578 2016-01-01 08:25:29 2016-01-01 08:29:02 2016-01-01 08:50:23
  14579 2016-01-01 10:38:55 2016-01-01 10:40:00 2016-01-01 11:06:43
  14580 2016-01-01 13:38:05 2016-01-01 13:45:23 2016-01-01 13:51:47
  ...
  </code></pre>
  
  <p>I then try to iterate through each row as such:</p>
  
  <pre><code>for i,j,k in df.iterrows():
      print(i,j,k)
  </code></pre>
  
  <p>But I get this error:</p>
  
  <pre><code>File "&lt;ipython-input-66-b6aadd823294&gt;", line 1, in &lt;module&gt;
  for i,j,k in df.iterrows():
  ValueError: not enough values to unpack (expected 3, got 2)
  </code></pre>
  
  <p>Just to be clear, here are the dimensions of df:</p>
  
  <pre><code>&gt;&gt;&gt;df.shape
  Out[68]: 
  (434, 3)
  </code></pre>