Coroutines with async and await syntax (Python 3.5)

With Python 3.5 released, the thing that drew my attention is the support for asynchronous programming through PEP 0492 -- Coroutines with async and await syntax, which added awaitable objects, coroutine functions, asynchronous iteration, and asynchronous context managers. I found the mailing list discussions (look both above and below) particularly helpful in understanding what exactly is going on.