title: python convert list to matrix and get value
body: <p>I'm quite new to python. I have a list of 16 1s and 0s in a nested list. </p>
  
  <pre><code>list([name_of_matrix],[1234567812345678], [another_name],[1234....])
  </code></pre>
  
  <p>Each of the number item <code>[12345678....]</code>in the list representing a 4x4 matrix like this:</p>
  
  <pre><code>1234
  5678
  1234
  5678
  </code></pre>
  
  <p>My goal is to get access to a number by <code>[row, col].</code> For example [2,3] would be row 2, col3, which is 7. How should I convert the list to achieve this? Many thanks in advance.  </p>