Simple socket chat server

server.py

import socket
import threading


class ThreadedServer(object):
    def __init__(self, host, port):
        self.host = host
        self.port = port
        self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        # self.sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
        self.sock.bind((self.host, self.port))
        self.clients = {}
        self.sentTo = {}

    def listen(self):
        self.sock.listen(5)
        while True:
            client, address = self.sock.accept()
            if client:
                self.clients[self.prettifyAddress(address)] = client
            client.settimeout(60)
            threading.Thread(target=self.listenToClient, args=(client, address)).start()

    def listenToClient(self, client, address):
        size = 1024
        while True:
            try:
                data = client.recv(size)
                if data:
                    # Set the response to echo back the recieved data
                    if data.replace("\n", "") == "ls":
                        response = str(self.clients.keys()) + "\n"
                    elif data[:2] == "/w":
                        fromAddress = self.prettifyAddress(address)
                        toAddress = data.split("/w")[1].lstrip().split(" ")[0]
                        message = "[" + fromAddress + "]: " + data.split(toAddress)[1].lstrip()
                        response = self.sendMessage(fromAddress=fromAddress, toAddress=toAddress, message=message)
                    elif data[:2] == "/r":
                        fromAddress = self.prettifyAddress(address)
                        if fromAddress in self.sentTo.keys():
                            toAddress = self.sentTo[fromAddress]
                            message = "[" + fromAddress + "]:" + data[2:].lstrip()
                            response = self.sendMessage(fromAddress=fromAddress, toAddress=toAddress, message=message)
                        else:
                            response = "No one to send to\n"
                    elif data[:2] == "me":
                    	response = self.prettifyAddress(address) + "\n"
                    else:
                        response = "Message received " + data + "\n"
                    client.sendall(response)
                else:
                    raise error('Client disconnected')
            except:
                del self.clients[":".join([str(address[0]), str(address[1])])]
                client.close()
                return False

    def sendMessage(self,
                    fromAddress=None,
                    toAddress=None,
                    message=None):
        if fromAddress in self.clients.keys():
            if toAddress in self.clients.keys():
                self.clients[toAddress].sendall(message)
                self.sentTo[toAddress] = fromAddress
                return "Me: " + message
            else:
                return "Client not found\n"
        else:
            return "Wrong from address\n"

    def prettifyAddress(self,
                        address=None):
        return ":".join([str(address[0]), str(address[1])])


if __name__ == "__main__":
    port_num = 8000
    ThreadedServer('', port_num).listen()