threading 多线程使用

实例 1
import threading #线程
import time

def Say(n):
    print('Test %d' %n)
    time.sleep(2)

if __name__ == '__main__':
    t1 = threading.Thread(target=Say,args=(10,))  #开一个线程,创建一个线程对象t1 target传递函数名 args传递参数
    t1.start()

    t2 = threading.Thread(target=Say, args=(2,))  # 开一个线程,创建一个线程对象t2  
    t2.start()

    print('Done')

运行结果是下面3个打印结果同时出现,2秒后程序运行结束:
　　Test 10
　　Test 2
　　Doen

实例2

import threading #线程
import time

def Beijing(n):
    print('Beijing time is start %s' % time.strftime('%Y-%m-%d %X', time.localtime()))
    time.sleep(2)
    print('Beijing time is over %s' % time.strftime('%Y-%m-%d %X', time.localtime()))


def Shanghai(n):
    print('Shanghai time is start %s' %time.strftime('%Y-%m-%d %X',time.localtime()))
    time.sleep(5)
    print('Shanghai time is over %s' %time.strftime('%Y-%m-%d %X',time.localtime()))


if __name__ == '__main__':
    t1 = threading.Thread(target=Beijing,args=(10,))  
    t1.start()  

    t2 = threading.Thread(target=Shanghai, args=(2,))  
    t2.start()

    print('Done')
运行结果是:
　　Beijing time is start 2018-05-29 17:29:25               
　　Shanghai time is start 2018-05-29 17:29:25　　　　　　　
　　Done
　　Beijing time is over 2018-05-29 17:29:27
　　Shanghai time is over 2018-05-29 17:29:30

#Beijing Shanghai 同时执行 然后接着运行打印Done;3秒后开始打印Beijing结束时间,接着再过2秒打印Shanghai结束时间