title: Python change objects in a list inplace
body: <p>This might not make a lot of sense, but I'd like to change the following to show <code>'x'</code> instead of <code>'a'</code></p>
  
  <pre><code>&gt;&gt;&gt; a = "a"
  &gt;&gt;&gt; b = "b"
  &gt;&gt;&gt; c = "c"
  &gt;&gt;&gt; d = [a, b, c]
  &gt;&gt;&gt; d[0] = "x"
  &gt;&gt;&gt; a
  'a'
  </code></pre>
  
  <p>Is it possible to have this behavior somehow? Not only for strings, but for other objects too.</p>