title: Multiply every other element in a list
body: <p>I have a list, let's say: <code>list = [6,2,6,2,6,2,6]</code>, and I want it to create a new list with every other element multiplied by 2 and every other element multiplied by 1 (stays the same).
  The result should be: <code>[12,2,12,2,12,2,12]</code>.</p>
  
  <pre><code>def multi():
      res = 0
      for i in lst[0::2]:
          return i * 2 
  
  print(multi)
  </code></pre>
  
  <p>Maybe something like this, but I don't know how to move on from this. How is my solution wrong?</p>