title: How to append a value to list attribute on AWS DynamoDB?
body: <p>I'm using DynamoDB as an K-V db (cause there's not much data, I think that's fine) , and part of 'V' is list type (about 10 elements). There's some session to append a new value to it, and I cannot find a way to do this in 1 request. What I did is like this:</p>
  
  <pre><code>item = self.list_table.get_item(**{'k': 'some_key'})
  item['v'].append('some_value')
  item.partial_save()
  </code></pre>
  
  <p>I request the server first and save it after modified the value. That's not atomic and looks ugly. Is there any way to do this in one request?</p>