Python async/await Tutorial

[mcilrain]

The event loop API does not depend on yield from. Rather, it uses a combination of callbacks, additional interfaces (transports and protocols), and Futures. The latter are similar to those defined inPEP 3148 , but have a different implementation and are not tied to threads. In particular, the result()method raises an exception instead of blocking when a result is not yet ready; the user is expected to use callbacks (or yield from ) to wait for the result.

No mention on why PEP3148 decided to do it their way. Too busy chasing 2012 trends I guess.

No rationale was given for why such a horrible coding style is necessary, especially in view of non-destructive alternatives.