title: how to order dictionary python (sorting)
body: <p>I use Python dictionary:</p>
  
  <pre><code>&gt;&gt;&gt; a = {}
  &gt;&gt;&gt; a["w"] = {}
  &gt;&gt;&gt; a["a"] = {}
  &gt;&gt;&gt; a["s"] = {}
  &gt;&gt;&gt; a
  {'a': {}, 's': {}, 'w': {}}
  </code></pre>
  
  <p>I need:</p>
  
  <pre><code>&gt;&gt;&gt; a
  {'w': {}, 'a': {}, 's': {}}
  </code></pre>
  
  <p>How can I get the order in which I filled the dictionary?</p>