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David Beazley Builds Async Programming in Python From Scratch

David Beazley · Tutorial · YouTube title: Build Your Own Async
Why it's here

HN people recommend it as the best way to understand what async machinery actually does under the covers.

What it covers

David Beazley's workshop screencast builds asynchronous programming in Python from scratch, starting from callbacks and continuations and replacing threads to show how concurrency works underneath.