How to delete every reference of an object in Python?
<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>
