AsyncIO support for beginners

Example of questions we’ll try to answer, it’s a compilation of questions we’ll already received:

• Where is the 101 of AsyncIO ?
• When I can use AsyncIO ?
• Why to add async/await keywords ? It’s only aliases of @asyncio.coroutine/yield from ?
• I don’t understand the difference between a task and a coroutine, could you explain me ?
• When I need to add await before a call function ?
• How to spot quickly the code can be asynchronous with synchronous code ?
• How I can use synchronous libraries in my asynchronous code ?
• How to architecture my source code with AsyncIO ?
• I don’t understand the internals of AsyncIO with event loop and how yield from works internally. (Spoiler alert: To start to code with Python itself, did you understand before the CPython’s internals ?)
• Why another asynchronous network framework ? Need already covered by Twisted/Tornado/Gevent/…
• Why some libraries need to be reimplemented, like aiohttp or aiopg ?
• Now that Django channels exist, AsyncIO is useless, isn’t it ?
• What’s the difference between AsyncIO, curio and Trio ?