title: Clear variable in python
body: <p>Is there a way to clear the value of a variable in python?</p>
  <p>For example if I was implementing a binary tree:</p>
  <pre><code>class Node:
      self.left = somenode1
      self.right = somenode2
  </code></pre>
  <p>If I wanted to remove some node from the tree, I would need to set <code>self.left</code> to empty.</p>