Can The Async Eventloop Switch Between Coroutines On The Await Call Itself?

Can the eventloop switch between coroutines: when async method is awaited (called), before it executes? when async method is awaited (called), after it executes? Here is an examp

Solution 1:

The event loop can't switch to other coroutines await unless the awaited coroutine (or other awaitable) chooses to suspend. Since some_slow_method doesn't contain a single await, it will never suspend and therefore the_caller() will never switch to another coroutine. The fact that the event loop doesn't always suspend on await is sometimes a source of bugs, as discussed here.

You can force some_slow_method to occasionally switch to other coroutines using await asyncio.sleep(0), but that is considered bad style because the asyncio thread should avoid doing CPU work. If you must do CPU-bound work, a better option is to make some_slow_method an ordinary def and run it using await loop.run_in_executor(None, some_slow). This will hand it off to a thread pool, suspend the current coroutine, and wake it up once the function has completed, transferring its return value (or exception if one was raised).