本篇文章给大家分享的是有关怎样理解Python线程池，小编觉得挺实用的，因此分享给大家学习，希望大家阅读完这篇文章后可以有所收获，话不多说，跟着小编一起来看看吧。
总结一下自己总结的对Python线程池经验之谈，对于那些没有接触学习过编程语言或者多开发语言略懂的用户而言，Python语言是绝对的选择之一，并建议初学的程序员先从Python开始学习编程。
import Queue, threading, sys from threading import Thread import time,urllib # working thread class Worker(Thread): worker_count = 0 def __init__( self, workQueue, resultQueue, timeout = 0, **kwds): Thread.__init__( self, **kwds ) self.id = Worker.worker_count Worker.worker_count += 1 self.setDaemon( True ) self.workQueue = workQueue self.resultQueue = resultQueue self.timeout = timeout self.start( ) def run( self ): ''' the get-some-work, do-some-work main loop of worker threads ''' while True: try: callable, args, kwds = self.workQueue.get(timeout=self.timeout) res = callable(*args, **kwds) print "worker[%2d]: %s" % (self.id, str(res) ) self.resultQueue.put( res ) except Queue.Empty: break except : print 'worker[%2d]' % self.id, sys.exc_info()[:2] class WorkerManager: def __init__( self, num_of_workers=10, timeout = 1): self.workQueue = Queue.Queue() self.resultQueue = Queue.Queue() self.workers = [] self.timeout = timeout self._recruitThreads( num_of_workers ) def _recruitThreads( self, num_of_workers ): for i in range( num_of_workers ): worker = Worker( self.workQueue, self.resultQueue, self.timeout ) self.workers.append(worker) def wait_for_complete( self): # ...then, wait for each of them to terminate: while len(self.workers): worker = self.workers.pop() worker.join( ) if worker.isAlive() and not self.workQueue.empty(): self.workers.append( worker ) print "All jobs are are completed." def add_job( self, callable, *args, **kwds ): self.workQueue.put( (callable, args, kwds) ) def get_result( self, *args, **kwds ): return self.resultQueue.get( *args, **kwds )Worker类是一个Python线程池，不断地从workQueue队列中获取需要执行的任务，执行之，并将结果写入到resultQueue中。这里的workQueue和resultQueue都是现成安全的，其内部对各个线程的操作做了互斥。当从workQueue中获取任务超时，则线程结束。
WorkerManager负责初始化Python线程池，提供将任务加入队列和获取结果的接口，并能等待所有任务完成。一个典型的测试例子如下，它用10个线程去下载一个固定页面的内容，实际应用时应该是执行不同的任务。
def test_job(id, sleep = 0.001 ): try: urllib.urlopen('[url]https://www.gmail.com/[/url]').read() except: print '[%4d]' % id, sys.exc_info()[:2] return id def test(): import socket socket.setdefaulttimeout(10) print 'start testing' wm = WorkerManager(10) for i in range(500): wm.add_job( test_job, i, i*0.001 ) wm.wait_for_complete() print 'end testing'以上就是怎样理解Python线程池，小编相信有部分知识点可能是我们日常工作会见到或用到的。希望你能通过这篇文章学到更多知识。更多详情敬请关注编程网行业资讯频道。
