title: numpy.array(list) being slow
body: <p>So I have a list with 5,000,000 integers. And I want to cover the list to a numpy array. I tried following code:</p>
  
  <pre><code>numpy.array( list )
  </code></pre>
  
  <p>But it is very slow. </p>
  
  <p>I benchmarked this operation for 100 times and loop over the list for 100 times. There is no much difference. </p>
  
  <p>Any good idea how to make it faster?</p>