title: Adding multiple values to an existing dictionary as SETS
body: <p>I have a dictionary where I have the data already inside, i.e. keys have values and some of them have more than one value.</p>
  
  <p>For example:</p>
  
  <pre><code>i = {"a": "111", "b": "222", "c": ["333", "444"]}
  </code></pre>
  
  <p>How can I change the type of the multiple values? I want them to be sets, not lists, such as:</p>
  
  <pre><code>i = {"a": {"111"}, "b": {"222"}, "c": {"333", "444"}}
  </code></pre>
  
  <p>One similar post is this one:
  <a href="https://stackoverflow.com/questions/20585920/how-to-add-multiple-values-to-a-dictionary-key-in-python">How to add multiple values to a dictionary key in python? [closed]</a></p>
  
  <p>There it is explained how to add multiple elements to a dictionary, but they always seem to be lists.</p>
  
  <p>How to change the type of the multiple values?
  OR how to add them to the dictionary as sets, not lists?</p>