broadcast python chat

chat.py

from socket import socket, AF_INET, SOCK_DGRAM, IPPROTO_UDP, SOL_SOCKET, SO_BROADCAST, SO_REUSEPORT, SO_REUSEADDR
from threading import Thread
import sys
import readline
class NetworkListener(Thread):
    def __init__(self, sock, run):
        self.sock = sock
        self.running=run
        super().__init__()
        self.daemon = True
        self.nicknames = {}
    def run(self):
        while self.running:
            data, addr = sock.recvfrom(1024) # buffer size is 1024 bytes
            msg = data.decode('utf-8')
            if msg[:6]=='/nick ':
                self.nicknames[addr]=msg[6:]
                print("\r{} is now known as {}".format(addr[0],
                                                     self.nicknames[addr]))
            else:
                print("\r[{}]: {}".format(self.nicknames.get(addr, addr[0]), msg))
            print("> ", flush=True, end="")
        
if __name__=='__main__':
    sock = socket(family=AF_INET, type=SOCK_DGRAM, proto=IPPROTO_UDP)
    ipaddr="0.0.0.0"
    if len(sys.argv)>1:
        ipaddr = sys.argv[1]
    print("Using interface {}".format(ipaddr))
    sock.setsockopt(SOL_SOCKET, SO_BROADCAST, 1)
    sock.setsockopt(SOL_SOCKET, SO_REUSEPORT, 1) 
    sock.setsockopt(SOL_SOCKET, SO_REUSEADDR, 1) 
    sock.bind(("0.0.0.0", 2000))

    sendsock = socket(family=AF_INET, type=SOCK_DGRAM, proto=IPPROTO_UDP)
    sendsock.setsockopt(SOL_SOCKET, SO_BROADCAST, 1)
    sendsock.setsockopt(SOL_SOCKET, SO_REUSEPORT, 1)
    sendsock.bind((ipaddr, 2000))
    running = True
    print("you can view nicknames mapping with /ip")
    print("\033[3mset your nickname\033[23m with \033[1m'/nick your_username'\033[0m")
    disp = NetworkListener(sock, running)
    disp.start()
    print("> ", end="")
    while running:
        try:
            msg = input()
            print(
                "\033[{}\033[1A\r{}".format(
                    len(msg),
                    len(msg)*" "
                ), end="", flush=True)
            if msg[:3] == "/ip":
                if msg[:4] == "/ip ":
                    inv_nick = {v: k for k, v in disp.nicknames.items()}
                    print("\r"+str(inv_nick.get(msg[4:].rstrip('\n'), 'no match')))
                else:
                    print("\r"+str(disp.nicknames))
                print("> ", end="", flush=True)
                continue
            if msg[:6] == "/tell ":
                try:
                    dest = msg[6:].split(" ")[0]
                    msg_secret = msg[(6+len(dest)):]
                    print("\r"+msg_secret)
                    inv_nick = {v: k for k, v in disp.nicknames.items()}
                    addr = inv_nick.get(dest, None)
                    if addr is None:
                        addr = (dest, 2000)
                    print("sending to {}".format(addr))
                    sendsock.sendto(bytes(msg_secret, 'utf-8'), addr)
                    continue
                except Exception as e:
                    print("\rnope, not sending")
                    print(e)
            tosend = bytes(msg, "utf-8")
            sendsock.sendto(tosend, ("192.168.0.255", 2000))
        except (KeyboardInterrupt, EOFError):
            running=False
            sys.exit(0)