多线程编程

多线程编程需要引用threading包

import threading
class mythread(threading.Thread):
 def __init__(self,num):
  threading.Thread.__init__(self)
  self.num=num
 def run(self):
  print('I am ',self.num)
t1=mythread(1)
t2=mythread(2)
t3=mythread(3)
t1.start()
t2.start()
t3.start()