9-server-code.py

from socket import *
from thread import *

host = ''
port = 3983

s = socket(AF_INET, SOCK_STREAM)
s.bind((host, port))
s.listen(10)

clients = []

def client_thread(c):
    try:
        clients.append(c)
        c.send('Wecome to the server, send me something: ')

        while True:
            data = c.recv(1024)
            if not data:
                break
            
            if '!q' in data:
                c.close()
                for index, client in enumerate(clients):
                    if c == client:
                        del clients[index]
            
            if data.split(' ')[0] == '!sendall':
                for client in clients:
                    client.sendall('{}'.format(''.join(data.split(' ')[1:])))
            else:
                c.sendall('OK...{}'.format(data))
    except:
        print('Client disconnected')

while 1:
    conn, addr = s.accept()
    print('Connected with {}:{}'.format(addr[0], addr[1]))

    start_new_thread(client_thread, (conn,))

s.close()