WebSockets with Python

Build the connection that lets a server speak first. You will perform the WebSocket opening handshake and encode every frame yourself, byte by byte, and then use a real library to run a live quiz-night scoreboard that pushes each score change to several viewers at once and closes cleanly.
You need HTTP with Python first: HTTP written and parsed by hand, buffered reads, struct, servers that stop on purpose, and fake connections in tests. Python Fundamentals II is recommended, not required.
You work in the site's browser editor and in a sandbox with no route to the public internet, so every live run starts a server and its clients inside one Python program on the loopback address, which is also how WebSocket code is tested in real projects. One project grows from a hand-built echo service into a tested scoreboard server that checks a token before it accepts anyone.