title: Can’t loop through a nested list
body: <p>I can’t seem to iterate through a nested loop.</p>
  <pre><code>lst = [[1,2,3],[1,2,3],[1,2,3]]
  for i in lst:
      print(lst.index(i))
  </code></pre>
  <p>The result I get is:</p>
  <pre><code>0
  0
  0
  </code></pre>
  <p>I expected to see:</p>
  <pre><code>0
  1
  2
  </code></pre>