LAN Chat with Python Displaying messages problem

I found the code for Socket Chatroom Server on the internet, here are the links:

Server -

https://pythonprogramming.net/server-chatroom-sockets-tutorial-python-3/

Client -

https://pythonprogramming.net/client-chatroom-sockets-tutorial-python-3/?completed=/server-chatroom-sockets-tutorial-python-3/

There is one small problem I have noticed and I can't solve it. Clients can't receive the messages from other clients before their own input. When the message comes, is there a way to block taking input and show the message from other clients first, and then continue to take input again? I know I should use threading for this problem but I have no idea how to implement it.