Python 3 Object-Oriented Programming - Third Edition

Reading an AsyncIO Future

An AsyncIO coroutine executes each line in order until it encounters an await statement, at which point, it returns control to the event loop. The event loop then executes any other tasks that are ready to run, including the one that the original coroutine was waiting on. Whenever that child task completes, the event loop sends the result back into the coroutine so that it can pick up execution until it encounters another await statement or returns.

This allows us to write code that executes synchronously until we explicitly need to wait for something. As a result, there is no nondeterministic behavior of threads, so we don't need to worry nearly so much about shared state.

It's still a good idea to avoid accessing ...