title: Get the key corresponding to the minimum value within a dictionary
body: <p>If I have a Python dictionary, how do I get the key to the entry which contains the minimum value?</p>
  
  <p>I was thinking about something to do with the <code>min()</code> function...</p>
  
  <p>Given the input:</p>
  
  <pre><code>{320:1, 321:0, 322:3}
  </code></pre>
  
  <p>It would return <code>321</code>.</p>