title: how can I maintain sequence of my list using set?
body: <pre><code>In [1]: l1 = ['a',2,3,0,9.0,0,2,6,'b','a']
  
  In [2]: l2 = list(set(l1))
  
  In [3]: l2
  Out[3]: ['a', 0, 2, 3, 6, 9.0, 'b']
  </code></pre>
  
  <p>Here you can see the the list l2 is falling with different sequence then the original l1, I need to remove the duplicate elements from my list without changing the sequence/order of the list elements....</p>