Example codes on multiprocessing module occur errors.
I attached the patch to fix these errors.

http://docs.python.org/dev/py3k/library/multiprocessing.html#module-
multiprocessing
"16.6.2.10. Listeners and Clients" section

Fix points are
1. Listener argument "authkey" must be a byte string
2. Client argument "authkey" must be a byte string
3. send_bytes argument must be a byte string

This is the server code listed on the section.
$ cat mpserver.py
from multiprocessing.connection import Listener
from array import array
address = ('localhost', 6000)     # family is deduced to be 'AF_INET'
listener = Listener(address, authkey='secret password')
conn = listener.accept()
print('connection accepted from', listener.last_accepted)
conn.send([2.25, None, 'junk', float])
conn.send_bytes('hello')
conn.send_bytes(array('i', [42, 1729]))
conn.close()
listener.close()

And the error is
$ python3.2 mpserver.py
Traceback (most recent call last):
  File "mpserver1.py", line 5, in <module>
    listener = Listener(address, authkey='secret password')
  File 
"/Users/kosmos/local/stow/py3k/lib/python3.2/multiprocessing/connection.
py", line 100, in __init__
    raise TypeError('authkey should be a byte string')
TypeError: authkey should be a byte string

My source code is svn revision 76151.
Regards.

---
Kouki Hashimoto
hsmtkk@gmail.com

Hello,
i've verified that the problem still exists in an up-to-date py3k branch, and that the proposed patch indeed fixes the bug.

Since the patch no more applies cleanly, I've refreshed it, and also added additional information about authkey that it must be a byte string.

Regards,
Sandro

Fixed in r85347 and r85348.