python的多进程

#多进程
import time
import  multiprocessing
class test:
    def tets1(self,a):
        for i in range(3):
            print(a)
            time.sleep(1)
    def tets2(self,b):
        for i in range(3):
            print(b)
            time.sleep(1)
if __name__ == ‘__main__‘:
    aa=test()
    t1=multiprocessing.Process(target=aa.tets1,args=(1,))
    t2=multiprocessing.Process(target=aa.tets2, args=(2,))
    #开启线程
    t1.start()
    t2.start()
    #等待t1进程结束，再执行下面的代码
    t1.join()
    print(‘3‘)