title: Append a new item to a list within a list
body: <p>I'm trying to append a new float element to a list within another list, for example:</p>
  
  <pre><code>list = [[]]*2
  list[1].append(2.5)
  </code></pre>
  
  <p>And I get the following:</p>
  
  <pre><code>print list
  [[2.5], [2.5]]
  </code></pre>
  
  <p>When I'd like to get:</p>
  
  <pre><code>[[], [2.5]]
  </code></pre>
  
  <p>How can I do this?</p>
  
  <p>Thanks in advance.</p>