Using the right Async tool, present day [EuroPython 2017 - Talk - 2017-07-11 - Arengo] [Rimini, Italy] Recent releases like AsyncIO and Django Channels gave a new push towards building real-time web-apps fast and easy. However, as similar tools exist in Python since 2000th, how should we balance between modern and time-proven? This talk includes but is not focused just on AsyncIO. It gives an overview of Async libraries in Python, and helps with choosing a right tool for various web tasks. It describes caveats of using Twisted, Tornado and AsyncIO including theory and live code, and concludes with a basic overview of Django Channels. Talk plan Why do we need Async Web (5 min) Existing libraries and frameworks: Twisted, Tornado, AsyncIO (15 min) Sample task, sample code, conclusions (10 min) (optional) what's about Django Channels? Q & A (5 min)