title: `try ... except not` construction
body: <p>Recently I met an example of code I've never seen before:</p>
  
  <pre class="lang-py prettyprint-override"><code>try:
      # a simple bunch of code
      if sample == 0:
          return True
      else:
          raise ExampleError()
  except not ExampleError:
      raise AnotherExampleError()
  </code></pre>
  
  <p>How does it work (if it works at all)?</p>