title: Making a set from dictionary values
body: <p>I want to create a set from the values of an existing dict</p>
  
  <pre><code>def function(dictionary):
      ... 
      return set_of_values
  </code></pre>
  
  <p>Say my dictionary looks like this: <code>{'1': 'Monday', '2': 'Tuesday', '3': 'Monday'}</code></p>
  
  <p>I want a set returned that only contains the unique values, like this: </p>
  
  <pre><code>{'Monday', 'Tuesday'}
  </code></pre>