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python多线程有几种实现方法,都是什么?
一般来说,使用线程有两种模式:
A 创建线程要执行的函数,把这个函数传递进Thread对象里,让它来执行;
B 继承Thread类,创建一个新的class,将要执行的代码 写到run函数里面。
第一种 创建函数并且传入Thread 对象中
import threading,time from time import sleep, ctime def now() : return str( time.strftime( '%Y-%m-%d %H:%M:%S' , time.localtime() ) ) def test(nloop, nsec): print 'start loop', nloop, 'at:', now() sleep(nsec) print 'loop', nloop, 'done at:', now() def main(): print 'starting at:',now() threadpool=[] for i in xrange(10): th = threading.Thread(target= test,args= (i,2)) threadpool.append(th) for th in threadpool: th.start() for th in threadpool : threading.Thread.join( th ) print 'all Done at:', now() if __name__ == '__main__': main()
第二种是创建一个新的class,将要执行的代码 写到run函数里面。
import threading ,time from time import sleep, ctime def now() : return str( time.strftime( '%Y-%m-%d %H:%M:%S' , time.localtime() ) ) class myThread (threading.Thread) : """docstring for myThread""" def __init__(self, nloop, nsec) : super(myThread, self).__init__() self.nloop = nloop self.nsec = nsec def run(self): print 'start loop', self.nloop, 'at:', ctime() sleep(self.nsec) print 'loop', self.nloop, 'done at:', ctime() def main(): thpool=[] print 'starting at:',now() for i in xrange(10): thpool.append(myThread(i,2)) for th in thpool: th.start() for th in thpool: th.join() print 'all Done at:', now() if __name__ == '__main__': main()
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原文地址:http://blog.csdn.net/djd1234567/article/details/46005807