title: How can I add data to a multivalued attribute in DynamoDB using boto?
body: <p>In my table, suppose I store some data like this :</p>
  
  <pre><code>Item(Table('test'), data={'id': '123', 'content': 'test', 'list': set([1,2,3,4])}).save()
  </code></pre>
  
  <p>This has a multivalued atribute 'list'. I want to search the table for id=123, and if it exists, update the 'list' attribute, by appending another list to it, say [5,6]</p>
  
  <p>Some searching around led me to <a href="https://stackoverflow.com/questions/10603840/is-it-possible-to-append-to-multi-valued-attributes-in-dynamodb">this stackoverflow answer</a>, which points to the UpdateItem operation, however I cannot find an example of how to use the ADD action. </p>
  
  <p>Could anyone provide an example of how I could do this? I am a beginner to both python and DynamoDB.</p>