What are all these deprecated “loop” parameters in asyncio?

Question

A lot of the functions in asyncio have deprecated loop parameters, scheduled to be removed in Python 3.10. Examples include as_completed(), sleep()

Answer 1

The loop parameter was the way to pass the global event loop around. New implementations of the same functions no longer require you to pass the global event loop, they instead just request it where it's needed.

As the documentation suggests https://docs.python.org/3/library/asyncio-eventloop.html: "Application developers should typically use the high-level asyncio functions, such as asyncio.run(), and should rarely need to reference the loop object or call its methods."

Removing the need for you to pass it around to library functions aligns with that principle. The loop is not replaced, but its disappearance simply means you no longer have to deal with it 'manually'.