python基本进程调用

from multiprocessing import Processimport osimport timedef info(name):    print("name:",name)    print('parent process:', os.getppid())    print('process id:', os.getpid())    print("------------------")    time.sleep(1)def foo(name):    info(name)if __name__ == '__main__':    info('main process line')    p1 = Process(target=info, args=('alvin',))    p2 = Process(target=foo, args=('egon',))    p1.start()    p2.start()    p1.join()    p2.join()    print("ending")