title: Set Comprehension in python
body: <p>In Python3 I wrote a simple one line code as follows :</p>
  
  <pre><code>{ 2*x  for x in {1,2,3,4} } 
  </code></pre>
  
  <p>but I m getting answer like this (order changed).</p>
  
  <pre><code>{8, 2, 4, 6}
  </code></pre>
  
  <p>Why I am getting answer <code>{8,2,4,6}</code> instead of <code>{2,4,6,8}</code>?</p>