Course overview

At the end of an alley in Mangwon-dong, Seoul, there is a small place whose lights come on at ten at night. The sign says Dongsi, a late-night diner. Its owner, Chef Yoon Seoyeon, spent twenty years building servers as a backend developer, and she still talks about her kitchen that way: "A kitchen is a program."

As of tonight, you are the new sous-chef. Over twelve services in the diner's first month, this 10-hour course teaches you the three Python tools for doing several things at once:

• threading: put more cooks in the kitchen.
• multiprocessing (and concurrent.futures): open more kitchens.
• asyncio: one person gets other work done while waiting.

The people in the kitchen

And on the last night of the month, a food critic arrives in disguise.

How a night goes

1. You get tonight's ticket, with the night's trouble and the goal written on it.
2. You learn the concepts and the code alongside the chef.
3. You run the kitchen yourself on the kitchen timeline. It is not an animation: real threads and real asyncio run on the server, and every task is drawn as a bar from the moment it actually started to the moment it actually finished.
4. When service ends, the day's tools go onto the chef's recipe card, one line each.

Each lesson is a complete night on its own, so feel free to pick just the nights you need.

What you need

• Working Python: functions, classes, with, exception handling. If you finished the regex course on this site, you are ready.
• Python 3.14. Every example was run and checked on 3.14. Results from the free-threaded build without the GIL (3.14t) are included too.
• The kitchen timeline runs right here on the page. To run the examples yourself, save them as a .py file and run python file.py. The multiprocessing examples in particular need to run from a file, not the interactive shell.