title: How to find largest number in file and see on which line it is
body: <p>The file looks like this:</p>
  
  <pre><code>1, a b
  2, c d
  3, e f
  </code></pre>
  
  <p>my current code </p>
  
  <pre><code>b = open('file.txt', 'r')
  
  c = b.readlines()
  regels = len(c)
  
  print(regels)
  </code></pre>
  
  <p>I got the numbers of lines but still need biggest number + on which line it is. </p>