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Priority Queue

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pq = PriorityQueue()

pq.put(('b', 1))
pq.put(('a', 1))
pq.put(('c', 1))
pq.put(('z', 0))
pq.put(('d', 2))

while not pq.empty():
  print pq.get(),   
# z b a c d
Get the implementation of Priority Queue <a href=>here</a>.