A function defined with async def; calling it returns a coroutine object that does nothing until it is awaited or wrapped in a task. A coroutine can pause at each await and let the event loop run something else, then resume where it stopped. Calling f() only creates the object; nothing runs yet.
Coroutine
A function defined with async def; calling it returns a coroutine object that does nothing until it is awaited or wrapped in a task.