title: python- constant dictionary?
body: <p>I simply generate a list of python dictionaries, and then serialize it to json.<br>
  Basically my code is a loop where I do something like:  </p>
  
  <pre><code>ls.append({..values..})
  </code></pre>
  
  <p>I don't change the dictionaries after this.  </p>
  
  <p>The question, is there a constant dictionary in python, obviously the point here is memory, since I know dictionary takes more memory than a list.  I simply need the structure of <code>{key:value}</code> for json,  not the other features of the dictionary.</p>
  
  <p>Just curious if I can optimize my code a bit.</p>