The Client for the "chat app" , you run the server first then this (this is only a concept not even close to what work is needed for a real chat app)

client.py

import socket
import threading
s= socket.socket(socket.AF_INET,socket.SOCK_STREAM)
s.connect((socket.gethostname(),1234))


def send():
    global s
    while True:
        s.send(bytes(
        input('MSG: '),'utf-8'))
def recieve():
    while True:
        global s
        msg = s.recv(1024).decode('utf-8')
        print(f'Server: \033[32m{msg}\033[0m\n')
t1 = threading.Thread(target=send)
t2 = threading.Thread(target=recieve)
t1.start()
t2.start()