IPC-->PIPO

Programing python 4th page 228

 1 """
 2 IPC
 3 http://www.cnblogs.com/BoyXiao/archive/2011/01/01/1923828.html
 4 """
 5 import os,time
 6 import threading
 7
 8 def child(pipeout):
 9     zzz = 0
10     while True:
11         time.sleep(zzz)                                             # make parent wait
12         msg=(‘spam %03d \n‘ % zzz).encode()                         # pipes are binary bytes
13         os.write(pipeout,msg)                                       # send to parent
14         zzz = (zzz+1)%5
15
16 def parent(pipein):
17     while True:
18         line = os.read(pipein,32)                                   # blocks until data sent
19         print(‘parent %d got [%s]  at [%s]‘%(os.getpid(),line,time.ctime()))
20
21 pipein,pipeout = os.pipe()
22 threading.Thread(target = child,args=(pipeout,)).start()
23 parent(pipein)