python 中的pipe

from multiprocessing import Process,Queue,Pipe
import os
def f(q):
#    q.send([42,None,'hello'])
print('This is child_conn ....' % q.recv())
#    q.close()
print 'Os getpid is %s...' % os.getpid()

if __name__=='__main__':
parent_conn,child_conn=Pipe()
parent_conn.send(['good',None,100])
p=Process(target=f,args=(child_conn,))
p.start()
print(parent_conn.recv())
parent_conn.close()
p.join()