title: Get complement (opposite) of list slice
body: <p>Is there syntax to get the elements of a list not within a given slice?
  Given the slice [1:4] it's easy to get those elements:</p>
  
  <pre><code>&gt;&gt;&gt; l = [1,2,3,4,5]
  &gt;&gt;&gt; l[1:4]
  [2, 3, 4]
  </code></pre>
  
  <p>If I want the rest of the list I can do:</p>
  
  <pre><code>&gt;&gt;&gt; l[:1] + l[4:]
  [1, 5]
  </code></pre>
  
  <p>Is there an even more succinct way to do this? I realize that I may be being too needy because this is already very concise.</p>
  
  <p>EDIT: I do not think that this is a duplicate of <a href="https://stackoverflow.com/questions/13115435/invert-slice-in-python">Invert slice in python</a> because I do not wish to modify my original list.</p>