title: How to find the maximum value in a list of tuples?
body: <p>I have a list with ~10^6 tuples in it like this:</p>
  <pre><code>[(101, 153), (255, 827), (361, 961), ...]
    ^     ^
    X     Y
  </code></pre>
  <p>I want to find the maximum value of the <code>Y</code>s in this list, but also want to know the <code>X</code> that it is bound to.</p>
  <p>How do I do this?</p>