title: Boolean Addition Assignment in Python
body: <p>Instead of writing</p>
  
  <p><code>a = a or b</code></p>
  
  <p>for Booleans a and b, I would like to write something like:</p>
  
  <p><code>a |= b</code> (or equals)</p>
  
  <p>but this doesn't work. Is there an equivalent to this concise statement in Python? Thanks.</p>