added multithreading

client.py

@@ -1,14 +1,30 @@
+import threading
 import socket
 
+alias = input("choose an alias: ")
 client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
-client.connect(("localhost", 9999))
+client.connect(('127.0.0.1', 9999))
 
-done = False
-
-while not done:
-	client.send(input("message: ").encode('utf-8'))
-	msg = client.recv(1024).decode('utf-8')
-	if msg != "quit":
-		print(msg)
+def client_receive():
+	while True:
+		try:
+			message = client.recv(1024).decode('utf-8')
+			if message == "alias?":
+				client.send(alias.encode('utf-8'))
 			else:
-		done = True
+				print(message)
+		except:
+			print('error')
+			client.close()
+			break
+
+def client_send():
+	while True:
+		message = f'{alias}: {input("")}'
+		client.send(message.encode('utf-8'))
+
+recieve_thread = threading.Thread(target = client_receive)
+recieve_thread.start()
+
+send_thread = threading.Thread(target=client_send)
+send_thread.start()

server.py

@@ -1,19 +1,45 @@
+import threading
 import socket
 
+host = "127.0.0.1"
+port = 9999
+
 server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
-server.bind(("localhost", 9999))
+server.bind((host, port))
 server.listen()
+clients = []
+aliases = []
 
-client, addr = server.accept()
+def broadcast(message):
+	for client in clients:
+		client.send(message)
+def handle_client(client):
+	while True:
+		try:
+			message = client.recv(1024)
+			broadcast(message)
+		except:
+			index = clients.index(client)
+			client.close()
+			alias = aliases[index]
+			broadcast(f'{alias} has left the chat room!'.encode('utf-8'))
+			aliases.remove(alias)
+			break
 
-done = False
+def receive():
+	while True:
+		print("server is running and listening")
+		client, address = server.accept()
+		print(f'connection is established with {(address)}')
+		client.send('alias?'.encode('utf-8'))
+		alias = client.recv(1024)
+		aliases.append(alias)
+		clients.append(client)
+		print(f'The alias of this client is {alias}'.encode('utf-8'))
+		broadcast(f'{alias} has connected to the chat room'.encode('utf-8'))
+		client.send("you are connected!".encode('utf-8'))
+		thread = threading.Thread(target = handle_client, args=(client,))
+		thread.start()
+if __name__ == "__main__":
+	receive()
 
-while not done:
-	msg = client.recv(1024).decode('utf-8')
-	
-	if msg == 'quit':
-		done = True
-	else:
-		print(msg)
-	
-	client.send(input("Message: ").encode('utf-8'))