title: Why can't I change element in reversed list?
body: <p>This is my code. I want to change "7" to "999" and print (1,2,3,4,5,6,999) with this method but it prints list1 unchanged (1,2,3,4,5,6,7). I don't understand why it doesn't change.</p>
  
  <pre><code>list1 = [1,2,3,4,5,6,7]
  
  list1[::-1][0] = 999
  print (list1)
  </code></pre>