python 多线程编程（三）

liyeho

threading模块是python线程很重要的一个模块，可以简化很多线程的操作，下面是个三个函数计算，可以看到单线程的情况下消耗了5秒钟，多线程的情况下只用了2秒多一点：
'''Created on 2012-3-9@author: Administrator'''#!/usr/bin/env pythonfrom MyThread import MyThreadfrom time import ctime,sleepdef fib(x):sleep(0.005)if x<2:return 1return (fib(x-2)+fib(x-1))def fac(x):sleep(0.1)if x<2:return 1return (x*fac(x-1))def sum(x):sleep(0.1)if x<2:return 1return (x+sum(x-1))funcs=[fib,fac,sum]n=12def main():nfuncs = range(len(funcs))print '*** single thread'for i in nfuncs:print 'starting',funcs.__name__,'at:',\ctime()print funcs(n)print funcs.__name__,'done at:',\ctime()print '\n*** multiple thread'threads=[]for i in nfuncs:t=MyThread(funcs,(n,),funcs.__name__)threads.append(t)for i in nfuncs:threads.start()for i in nfuncs:threads.join()print threads.getResult()print 'all done'if __name__=='__main__':main()　　运行结果：
*** single threadstarting fib at: Fri Mar 09 17:38:03 2012233fib done at: Fri Mar 09 17:38:05 2012starting fac at: Fri Mar 09 17:38:05 2012479001600fac done at: Fri Mar 09 17:38:06 2012starting sum at: Fri Mar 09 17:38:06 201278sum done at: Fri Mar 09 17:38:08 2012*** multiple threadstarting fib at: Fri Mar 09 17:38:08 2012starting fac at: Fri Mar 09 17:38:08 2012starting sum at: Fri Mar 09 17:38:08 2012sumfac  done at:done at:  Fri Mar 09 17:38:09 2012Fri Mar 09 17:38:09 2012fib done at: Fri Mar 09 17:38:10 201223347900160078all done
　　MyThread的代码如下：
　　'''Created on 2012-3-9@author: Administrator'''#!/usr/bin/env pythonimport threadingfrom time import ctimeclass MyThread(threading.Thread):def __init__(self,func,args,name=''):threading.Thread.__init__(self)self.name=nameself.func=funcself.args=argsdef getResult(self):return self.res  def run(self):print 'starting',self.name,'at:',\ctime()self.res=apply(self.func,self.args)print self.name,'done at:',\ctime()