Create a Python-based Internet chat application with a server program and a client program. The server manages a chat group, allowing any number of clients to join the group with a user name at any time.

(1) Broadcast: Any client is able to send a text to the server, which will relay it to all other clients for display.

(2) Broadcast: Any client is able to send a file of any type to the group via the server.

(3) Unicast: Any client is able to send a private message to a specific other client via the server.

(4) Unicast: Any client is able to send a private file of any type to a specific other client via the server.

(5) Blockcast: Any client is able to send a text to all other clients except for one via the sever.