title: Python list subtraction operation
body: <p>I want something like this:</p>
  <pre><code>&gt;&gt;&gt; x = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0]
  &gt;&gt;&gt; y = [1, 3, 5, 7, 9]  
  &gt;&gt;&gt; y - x
  # should return [2,4,6,8,0]
  </code></pre>