多线程

线程是应用程序中工作的最小单元。

多线程是现实有两种方式：

方法一：将要执行的方法作为参数传给Thread的构造方法（和多进程类似）

t = threading.Thread(target=action, args=(i,))

方法二：从Thread继承，并重写run()

所以如果重写了run，就直接调用run的函数了，如果run没有重新，就调用target函数。

实例

import threading方法一def worker(n):    print("start worker{0}".format(n))方法二class Mythread(threading.Thread):    def __init__(self,args):        super(Mythread,self).__init__()        self.args = args    def run(self):        print("start MyThread{0}".format(self.args))if __name__ == "__main__":    for i in xrange(1,6):        t1 = threading.Thread(target=worker,args=(i,))        t1.start()    t1.join()    for x in xrange(6,11):        t2 = Mythread(x)        t2.start()    t2.join()输出结果：start worker1start worker2start worker3start worker4start worker5start MyThread6start MyThread7start MyThread8start MyThread9start MyThread10

线程锁

通过threading.Lock()来创建锁，函数在执行的只有先要获得锁，左后执行完以后要释放锁：

with lock：

lock.acquire()

lock.release()

import threadingimport timedef worker(name,lock):    with lock:        print("start {0}".format(name))        time.sleep(5)        print("end {0}".format(name))if __name__ == "__main__":    lock = threading.Lock()    t1 = threading.Thread(target=worker, args=("worker1", lock))    t2 = threading.Thread(target=worker, args=("worker2", lock))    t1.start()    t2.start()    print("main end.")输出结果start worker1main end.end worker1   #中间间隔5秒start worker2end worker2