title: Python: an efficient way to slice a list with a index list
body: <p>I wish to know an efficient way and code saving to slice a list of thousand of elements</p>
  
  <p>example: </p>
  
  <pre><code>b = ["a","b","c","d","e","f","g","h"] 
  index = [1,3,6,7] 
  </code></pre>
  
  <p>I wish a result like as:</p>
  
  <pre><code>c = ["b","d","g","h"] 
  </code></pre>