title: Print list of lists in matrix format
body: <p>I have a list of lists:</p>
  <pre><code>[[15 16 18 19 12 11],[13 19 23 21 16 12],[12 15 17 19 20 10],[10 14 16 13 9  6]]
  </code></pre>
  <p><strong>The length of each list in the list is the same</strong>.
  I want to print out as rows and columns such as:</p>
  <pre><code>15 16 18 19 12 11
  
  13 19 23 21 16 12
  
  12 15 17 19 20 10
  
  10 14 16 13  9  6 
  </code></pre>
  <p>I know I can do it by using</p>
  <pre><code>lst = (' '.join(map(str,lst))), 
  </code></pre>
  <p>But I want every integer to indent at the same level like the <code>9</code> should be indented below the <code>0</code> of <code>20</code>, and <code>6</code> should be under <code>0</code> of <code>10</code>.</p>