Question

When I run the client / server together, and try to send a message, it doesn’t seem like either of them recieves anything. Why?

client.py:

import socket, sys
import threading

# Client for WutChat #

PORT = 5000

queue = []

def exitClient(s):
    s.close()
    print "Exiting..."
    sys.exit()

def connect(host, port):
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    try: s.connect((host, port))
    except: return "error"
    return s

def recieveData(s):
    while True:
        data = s.recv(512)
        if not data: continue
        if data in queue:
            continue
        queue.append(data)
        print data

def sendData(s):
    while True:
        try: data = raw_input(">")
        except EOFError: exitClient(s)
        if data == "": print "no msg"; continue;
        if data.startswith("/"):
            print "Command detected"
            continue
        s.send(data)

if __name__ == "__main__":
    s = connect(sys.argv[1], int(sys.argv[2]))
    threading.Thread(target=recieveData, args=(s,)).start()
    threading.Thread(target=sendData, args=(s,)).start()

server.py:

import socket, sys
import threading

# Server for WutChat #

PORT = 5000
DEBUG = True

conns = {}
msgqueue = []

def connect():
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    try: s.bind(("", int(sys.argv[1])))
    except IndexError: s.bind(("", PORT))
    s.listen(1)

    while True:
        addr, obj = s.accept()
        conns[addr] = obj

        print str(addr)+" connected!"

        threading.Thread(target=handle, args=(addr, obj, s,)).start()


def handle(addr, obj, s):
    while True:
        try: msg = obj.recv(512)
        except:
            continue

        print msg
        msg = addr + msg

        msgqueue.append(msg)
        if DEBUG: print msgqueue

        for conn in conns:
            for message in msgqueue:
                conns[conn].send(message)
                del message

if __name__ == "__main__":
    connect()

Answer 1

You have switched around the resulting tuple of accept:

addr,obj = s.accept()

should be

obj,addr = s.accept()

To find errors like these, remove the generic try..except block in handle, and catch only the specific errors you want to. In your specific case (if obj.recv fails), you can catch socket.error, but the only sensible thing to do when that happens is to close the socket and terminate the thread.

On an unrelated note, you may want to have a more descriptive name than obj. How about client_sock or simply sock?

Also,

msg = addr + msg

will fail because addr is a tuple, and msg a bytestring. You want

msg = repr(addr).encode('utf-8') + msg

Additionally,

del message

just removes the name message, and is a no-op in your case. You probably want to use Queue.get instead.