Async Python, by Running the Loop
The event loop, coroutines and tasks, and the patterns real async code is built from - each one runnable in your browser.
About this track
Async Python confuses people because it looks like threading and is not: it is one thread running an event loop that lets coroutines step aside at every await, so a thousand waits can overlap without a thread each. This track builds that model from the loop up.
Every page runs. The examples end in await main() because the editor already has a loop going, and each one prints the thing being explained - the interleaving of two coroutines, the difference between sequential awaits and concurrent tasks, a blocking call freezing the loop, a bounded queue applying backpressure.