title: Can I use python slicing to access one "column" of a nested tuple?
body: <p>I have a nested tuple that is basically a 2D table (returned from a MySQL query). Can I use slicing to get a list or tuple of one "column" of the table?</p>
  
  <p>For example:</p>
  
  <pre><code>t = ((1,2,3),(3,4,5),(1,4,5),(9,8,7))
  
  x = 6
  </code></pre>
  
  <p>How do I efficiently check whether <code>x</code> appears in the 3rd position of any of the tuples?</p>
  
  <p>All the examples of slicing I can find only operate within a single tuple. I don't want to slice a "row" out of t. I want to slice it the other way -- vertically.</p>