title: Python - convert list of lists into matrix
body: <p>I am using python, I have a list which contains inside it group of lists 
  how can I convert it into one matrix?</p>
  
  <p>for example, </p>
  
  <pre><code>Root_List = [list1  list2  list3]
  list1 = [1 2 3]
  list2 = [1 5 9]
  list3 = [2 4 1]
  </code></pre>
  
  <p>I need matrix to have below value</p>
  
  <pre><code>[
  1 2 3
  1 5 9
  2 4 1
  ]
  </code></pre>
  
  <p>Any idea? 
  Thank you in advanced.</p>