单线程&多线程

1.基于python的单线程示例：

from time import ctime,sleep
import time
def play_video(video):
    for i in range(2):
        print ("I am playing video: %s at %s"%(video,ctime()))
        sleep(5)


def play_music(music):
    for i in range(2):
          print ("I am playing music: %s at %s"%(music,ctime()))
          sleep(5)

time_start =time.time()
if __name__=="__main__":

 play_video("speed_and_crazy")
 play_music("chengdu")

 print ("all are over at %s"%ctime())

 time_end = time.time()
 result = time_end - time_start
 print("This program needs %f s" % result)from time import cti