06 进程状态检查

# 了解:is_alive
from multiprocessing import Process
import time, os
def task():
    print('%s is running,parent id is <%s>' % (os.getpid(), os.getppid()))
    time.sleep(3)
    print('%s is done,parent id is <%s>' % (os.getpid(), os.getppid()))
if __name__ == '__main__':
    p = Process(target=task, )
    p.start()
    print(p.is_alive())
    p.join()
    print('主', os.getpid(), os.getppid())
    print(p.pid)
    print(p.is_alive())