title: How to delete every reference of an object in Python?
body: <p>Supose you have something like:</p>
  
  <pre><code>x = "something"
  b = x
  l = [b]
  </code></pre>
  
  <p>How can you delete the object only having one reference, say x?</p>
  
  <p><code>del x</code> won't do the trick; the object is still reachable from b, for example.</p>