Let’s look at a few other elements that are key to asynchronous applications in Python. The asyncio library creates and manages event loops, the mechanisms that run coroutines until they complete.

In Python, however, the benefits of threading are diminished ... Calling reactor.run() in Twisted simply starts the event loop, and run() exits when the application finishes, the same as an event loop ...

An event loop is often the main loop in a program that typically waits for the user to trigger something. The following example is the main loop in the first software engine for this encyclopedia.