Hands-On Reactive Programming with Python

Event loop

The event loop is the entity of AsyncIO and is in charge of scheduling all asynchronous actions that must executes concurrently. Fundamentally, it is just an infinite loop that waits for some events to happen and execute handlers associated with these events. In the case of AsyncIO, these handlers are coroutines.

An event loop is automatically created by asyncio when a process is started. A reference to this event loop can be retrieved with the get_event_loop function of the asyncio module. Event loops inherit from the BaseEventLoop abstract class.

This class contains several methods used to execute asynchronous code. One of them is the run_until_complete method. With these two methods, the wait coroutine of the previous part ...