title: Extracting the a value from a tuple when the other values are unused
body: <p>I have a tuple <code>foo</code> which contains something I don't care about and something I do.</p>
  
  <pre><code>foo = (something_i_dont_need, something_i_need)
  </code></pre>
  
  <p>Is it more correct to use</p>
  
  <pre><code>_, x = foo
  </code></pre>
  
  <p>or </p>
  
  <pre><code>x = foo[1]
  </code></pre>
  
  <p>The only things I can think of are different behaviour if <code>foo</code> isn't of length two.
  I suppose this is fairly case-specific, but is one of these the de-facto pythonic way of doing things?</p>