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()
