Example of asyncio usage ensuring that printed messages are displayed on-time

slicer_asyncio_example.py

import asyncio
import time


def app_print(*args, **kwargs):
    print(*args, **kwargs)
    slicer.app.processEvents()


async def say_after(delay, what):
    await asyncio.sleep(delay)
    app_print(what)


async def main():
    app_print(f"started at {time.strftime('%X')}")

    await say_after(1, 'hello')
    await say_after(2, 'world')

    app_print(f"finished at {time.strftime('%X')}")


asyncio.run(main())