title: How to declare an array using all elements of another array?
body: <p>Assume I have a "constant" like:</p>
  
  <pre><code>ITEMS = [ "item1", "item2" ]
  </code></pre>
  
  <p>Now I would like to create an array that contains all entries of <code>ITEMS</code>, plus some more.</p>
  
  <p>Obviously, this is wrong:</p>
  
  <pre><code>more_things = [ "all", ITEMS ]
  </code></pre>
  
  <p>as it would put the whole array into the new array. But I want the new array to contain <code>[ "all", "item1", "item2" ]</code> in the end. </p>
  
  <p>Sure, I could somehow iterate the first array, but I am wondering if there is a more idiomatic one liner way to do this. Ideally, it should work for python2 and python3.</p>