title: How to determined if a 2 dimensional list contain a value?
body: <p>I have a list like following</p>
  
  <pre><code>mylist = [('value1', 'value2', 'value3'), ('secval1', 'secval2', 'secval3')]
  </code></pre>
  
  <p>how do I see if the list contains 'value2'?</p>