This is the server you're supposed to run for the "chat app", then run client.py

server.py

import socket
import multiprocessing
import threading
import time
class server:
    def setup(self):
        print('Setting Up Server..')
        s = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
        s.bind((socket.gethostname(),1234))
        print('[+] Server Setup and Listening [+]')
        s.listen(5)
        self.client,self.address = s.accept()
        print(f'[+] {self.address[0]} Connected! [+]')
    def sendmsg(self):
        print('Ready to send messages')
        while True:
            msg = bytes(input('Msg: '),'utf-8')
            self.client.send(msg)
    def recmsg(self):
        print('Ready to recieve messages')
        while True:
            re_msg = self.client.recv(1024).decode('utf-8')
            print(f'{self.address[0]} :\033[32m{re_msg}\033[0m')

serv1 = server()
serv1.setup()
time.sleep(1)
t1 = threading.Thread(target=serv1.sendmsg)
t2 = threading.Thread(target=serv1.recmsg)
t1.start()
t2.start()