title: Python: creating a comma separated string from a query
body: <p>I have a query</p>
  
  <pre><code> messages = Message.objects.all()
  </code></pre>
  
  <p>I want to create a Create a comma separated string of all numbers from message.number</p>
  
  <p>This is what I have tried:</p>
  
  <pre><code>number = ""
  for obj in messages:
       number = number + "," + obj.number
  </code></pre>
  
  <p>How can I do this? PS this string can be VERY long over 400,000 numbers!</p>