ソケットからやりなおす まずは公式から http://docs.python.jp/2.7/library/socket.html#socket-example

client.py

#!/usr/bin/env python
# coding: utf-8

import sys
import socket

HOST = 'localhost'
PORT = 50007
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((HOST, PORT))
s.send(sys.argv[1])
data = s.recv(1024)
s.close()
print 'Received', repr(data)
# Received 'hello'

server.py

# http://docs.python.jp/2.7/library/socket.html#socket-example

#!/usr/bin/env python
# coding: utf-8

import socket

HOST = 'localhost'
PORT = 50007
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind((HOST, PORT))
s.listen(1)
conn, addr = s.accept()
print 'Connect conn', conn
# Connect conn <socket._socketobject object at 0x123456abc>
print 'Connected by', addr
# Connected by ('127.0.0.1', 57111)
# ...
# Connected by ('127.0.0.1', 57185)
while 1:
    data = conn.recv(1024)
    if not data:
        break
    conn.send(data)
conn.close()