title: Multiprocessing - Pipe vs Queue
body: <p>What are the fundamental differences between queues and pipes in <a href="http://docs.python.org/library/multiprocessing.html" rel="noreferrer">Python's multiprocessing package</a>?</p>
  
  <p>In what scenarios should one choose one over the other?  When is it advantageous to use <code>Pipe()</code>?  When is it advantageous to use <code>Queue()</code>?</p>