多线程实例:
共节省两秒时间,以最大的时间为准,小的时间就是省下来的时间。
IO密集型项目,多线程可以节省时间,像爬虫这样的项目
计算密集型项目,就是用C来代替python写。
或者可以是协和+多进程。
import threading import time from time import ctime,sleep def music(func): for i in range(2): print("I was listening to %s.%s" %(func,ctime())) sleep(1) print("end listening %s" % ctime()) def movie(func): for i in range(2): print("I was at the %s %s" %(func,ctime())) sleep(5) print("end watch %s" % ctime()) threads = [] t1 = threading.Thread(target=music,args=("overstock",)) threads.append(t1) t2 = threading.Thread(target=movie,args=("kill them all",)) threads.append(t2) if __name__ =="__main__": for t in threads: t.start() print("all over %s" %ctime()) 执行结果: I was at the kill them all Thu May 23 21:26:14 2019 all over Thu May 23 21:26:14 2019 end listening Thu May 23 21:26:15 2019 I was listening to overstock.Thu May 23 21:26:15 2019 end listening Thu May 23 21:26:16 2019 end watch Thu May 23 21:26:19 2019 I was at the kill them all Thu May 23 21:26:19 2019 end watch Thu May 23 21:26:24 2019
单线程实例:
import time from time import ctime,sleep def music(func): for i in range(2): print("I was listening to %s.%s" %(func,ctime())) sleep(1) def movie(func): for i in range(2): print("I was at the %s %s" %(func,ctime())) sleep(5) if __name__ =="__main__": music(u'七里香') movie(u'kill them all') 执行结果: #注意时间间隔 I was listening to 七里香.Thu May 23 21:31:12 2019 I was listening to 七里香.Thu May 23 21:31:13 2019 I was at the kill them all Thu May 23 21:31:14 2019 I was at the kill them all Thu May 23 21:31:19 2019