Python优先队列实现方法示例

import Queue
import threading
class Job(object):
  def __init__(self, priority, description):
    self.priority = priority
    self.description = description
    print 'New job:', description
    return
  def __cmp__(self, other):
    return cmp(self.priority, other.priority)
q = Queue.PriorityQueue()
q.put(Job(3,'Mid-level job'))
q.put(Job(10,'Low-level job'))
q.put(Job(1,'Important job'))
def process_job(q):
  while True:
    next_job = q.get()
    print 'Processing job:', next_job.description
    q.task_done()
workers = [threading.Thread(target=process_job,args=(q,)),
      threading.Thread(target=process_job,args=(q,)),]
for w in workers:
  w.setDaemon(True)
  w.start()
q.join()

New job: Mid-level job
New job: Low-level job
New job: Important job
Processing job: Important job
Processing job: Mid-level job
Processing job: Low-level job