python 多进程

#多进程，并行方式执行
# from multiprocessing import Process
# import time

# def f(name):
#     time.sleep(1)
#     print('hello',name,time.ctime())
#
# if __name__ == '__main__':
#     p_list=[]
#
#     for i in range(3):
#         p = Process(target=f,args=('jack',))
#         # p.daemon=True     #守护进程
#         p_list.append(p)
#         p.start()
#
#     for i in p_list:
#         i.join()     #所有子进程没有执行完，主进程停在这里不去执行
#     print('end,..')

#2.例子,gid
# from multiprocessing import Process
# import os,time
#
# def info(title):
#
#     print("title:",title)
#     print("parent process:",os.getppid())
#     print("process id:",os.getpid())
#
#     def f(name):
#         info('function f')
#         print("hello",name)
#
# if __name__ == '__main__':
#     info('main process line')
#     time.sleep(1)
#     print('--------------')
#     p = Process(target=info,args=('jack',))
#     p.start()
#     p.join()