MyEchoClient.java

import java.io.*;
import java.net.*;

public class MyEchoClient {
    public static void main(String args[]) {
	try {
	    Socket sock = new Socket("127.0.0.1" , 10007);
	    InputStream in = sock.getInputStream();
	    OutputStream out = sock.getOutputStream();
	    String str = "hello\n";

	    out.write(str.getBytes());
	    out.flush();

	    byte[] buf = new byte[1024];

	    int n = in.read(buf);
	    System.out.write(buf, 0, n);
	    sock.close();
	} catch (Exception e) {}
    }
}

myechoclient.py

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

import socket

def _send_message(host, port, message):
    sock = socket.create_connection((host, port))
    sock.sendall(message)
    resp = sock.recv(1024)
    sock.close()    

    print 'Response: %s' % resp

if __name__ == '__main__':
    host = ''
    port = 10007
    message = 'hi'

    _send_message(host, port, message)

myechoserver.py

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

import SocketServer

class MyHandler(SocketServer.BaseRequestHandler):
    def handle(self):
        self.data = self.request.recv(1024)

        print '"%s" connected, and sent "%s"' % \
            (self.client_address[0], self.data)

        self.request.send(self.data.upper())

if __name__ == '__main__':
    host = 'localhost'
    port = 10007

    server = SocketServer.TCPServer((host, port), MyHandler)
    server.serve_forever()