Basic Python client socket example

Question

I've been trying to wrap my head around how sockets work, and I've been trying to pick apart some sample code I found at this page for a very simple client socket program. Since this is basic sample code, I assumed it had no errors, but when I try to compile it, I get the following error message.

File "client.py", line 4, in client_socket.connect(('localhost', 5000)) File "", line 1, in connect socket.error: [Errno 111] Connection refused

I've googled pretty much every part of this error, and people who've had similar problems seem to have been helped by changing the port number, using 'connect' instead of 'bind,' and a few other things, but none of them applied to my situation. Any help is greatly appreciated, since I'm very new to network programming and fairly new to python.

By the way, here is the code in case that link doesn't work for whatever reason.

#client example
import socket
client_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
client_socket.connect(('localhost', 5000))
while 1:
    data = client_socket.recv(512)
    if ( data == 'q' or data == 'Q'):
        client_socket.close()
        break;
    else:
        print "RECIEVED:" , data
        data = raw_input ( "SEND( TYPE q or Q to Quit):" )
        if (data <> 'Q' and data <> 'q'):
            client_socket.send(data)
        else:
            client_socket.send(data)
            client_socket.close()
            break;

Answer 1

Here is the simplest python socket example.

Server side:

import socket

serversocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
serversocket.bind(('localhost', 8089))
serversocket.listen(5) # become a server socket, maximum 5 connections

while True:
    connection, address = serversocket.accept()
    buf = connection.recv(64)
    if len(buf) > 0:
        print buf
        break

Client Side:

import socket

clientsocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
clientsocket.connect(('localhost', 8089))
clientsocket.send('hello')

• First run the SocketServer.py, and make sure the server is ready to listen/receive sth
• Then the client send info to the server;
• After the server received sth, it terminates