title: Modify output from Python Pandas describe
body: <p>Is there a way to omit some of the output from the pandas describe?
  This command gives me exactly what I want with a table output (count and mean of executeTime's by a simpleDate)</p>
  
  <pre><code>df.groupby('simpleDate').executeTime.describe().unstack(1)
  </code></pre>
  
  <p>However that's all I want, count and mean. I want to drop std, min, max, etc... So far I've only read how to modify column size.</p>
  
  <p>I'm guessing the answer is going to be to re-write the line, not using describe, but I haven't had any luck grouping by simpleDate <strong>and</strong> getting the count with a mean on executeTime.</p>
  
  <p>I can do count by date:</p>
  
  <pre><code>df.groupby(['simpleDate']).size()
  </code></pre>
  
  <p>or executeTime by date:</p>
  
  <pre><code>df.groupby(['simpleDate']).mean()['executeTime'].reset_index()
  </code></pre>
  
  <p>But can't figure out the syntax to combine them.</p>
  
  <p>My desired output:</p>
  
  <pre><code>            count  mean  
  09-10-2013      8  20.523   
  09-11-2013      4  21.112  
  09-12-2013      3  18.531
  ...            ..  ...
  </code></pre>