title: Quick way to de-list a nested list
body: <p>I have a list that looks like this:</p>
  
  <pre><code>N_y=[[[1,2,3],[4,5,3],[2,5,8]]]
  </code></pre>
  
  <p>How do I breakdown <code>N_y</code> to just one list of items, ie:</p>
  
  <p>Output expected: <code>[[1,2,3],[4,5,3],[2,5,8]]</code></p>
  
  <p>My attempt:</p>
  
  <pre><code>j=str(N_y)[1:-1]
  print j
  </code></pre>
  
  <p>Output <code>"[[1,2,3],[4,5,3],[2,5,8]]"</code></p>
  
  <p>The problem now is, <code>j</code> comes out as a sting. Is there a quick method for de-listing without outputting strings?</p>
  
  <p>Any suggestions? Thanks.</p>