Help pickling across sockets

[Jonathan Hayward]

I'm trying to have a client open a socket, send two pickled hashes,
and receive a pickled object (I'm also writing the server, to listen,
read two pickled hashes, and send a pickled object). I've been able to
boil down what doesn't work to a small demo case:
____________________________________________________________

SERVER:
#!/usr/bin/python

import cPickle, socket

sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
sock.bind(("", 1234))
sock.listen(5)

try:
    newsocket, address = sock.accept()
    sockOut = newsocket.makefile("wb")
    sockIn = newsocket.makefile("rb")
    cPickle.load(sockIn)
    cPickle.load(sockIn)
    cPickle.dump("Hello, world!", sockOut)
    newsocket.close()
    sockOut.close()
    sockIn.close()
finally:
    sock.close()
____________________________________________________________

CLIENT:
#!/usr/bin/python

import cPickle, socket

sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.connect(("127.0.0.1", 1234))
sockOut = sock.makefile("wb")
sockIn = sock.makefile("r")
cPickle.dump({}, sockOut)
cPickle.dump({}, sockOut)
response_data = cPickle.load(sockIn)
print response_data
sockOut.close()
sockIn.close()
sock.close()
____________________________________________________________

When I start the server and then start the client, they both hang, as
has happened with the real script. Can you tell me what I am misusing
and preferably how to correct it?

TIA,

++ Jonathan Hayward, jonathan.hayward at pobox.com
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