title: Print row in python
body: <p>What can I change so that I will get a list of only the first row?
  i.e </p>
  
  <pre><code>0 1
  1 2
  2 3
  3 4
  </code></pre>
  
  <p>I have tried the below:</p>
  
  <pre><code>matrix = [[1, 2, 3, 4],
      [3, 5, 7, 9],
      [4, 6, 8, 10],
      [5, 7, 9, 11]]
  for index in range(len(matrix)):
      print(index,matrix[index][0])
  
  0 1
  1 3
  2 4
  3 5
  </code></pre>