title: Python a &= b meaning?
body: <p>What does the <code>&amp;=</code> operator mean in Python, and can you give me a working example?</p>
  
  <p><a href="http://docs.python.org/2/library/operator.html#operator.iand" rel="noreferrer">I am trying to understand the <code>__iand__</code> operator.</a>  </p>
  
  <p>I just don't know what <code>&amp;=</code> means and have looked online but couldn't find it.</p>