Can you explain what asynchronous task execution in Python is and how it works?

Asynchronous execution of tasks in Python allows running operations that may take time (for example, input/output) without blocking the main thread of execution. This is achieved using the keywords async and await, as well as the event loop.

The main idea is that a task (coroutine) releases control while waiting for a result, allowing other tasks to run. This increases efficiency, especially when working with network requests or files.

Example of an asynchronous function:

import asyncio

async def say_hello():
    print('Hello')
    await asyncio.sleep(1)  # simulate delay
    print('World')

async def main():
    await say_hello()

asyncio.run(main())

Here, asyncio.sleep is a non-blocking delay that allows other tasks to execute during this time.