使用NPE的策略-一個(gè)tuple作為隊(duì)列優(yōu)先級(jí)，tuple是(fpriority, spriority)：import Queue

class Job(object):

def __init__(self, fpriority, spriority, description='blah', iata='foo' , hops='ample', cost='free pitchers'):

self.fpriority = fpriority

self.spriority = spriority

self.description = description

@property

def priority(self):

return (self.fpriority, self.spriority)

def __str__(self):

return self.description

q = Queue.PriorityQueue()

second = Job(2, 5, 'Mid-level job')

third = Job(2, 20, 'Low-level job')

first = Job(1, 20, 'Important job')

q.put((second.priority, second))

q.put((third.priority, third))

q.put((first.priority, first))

while q.unfinished_tasks:

task = q.get()

print task, task[1]

q.task_done()

>>>

((1, 20), <__main__.job object at>) Important job

((2, 5), <__main__.job object at>) Mid-level job

((2, 20), <__main__.job object at>) Low-level job

>>>

這對(duì)優(yōu)先級(jí)元組中的任意數(shù)量的項(xiàng)都有效。在

^{pr2}$

總結(jié)

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