Asyncio quick test

README.md

asyncio

Quick test/tutorial on concurrent tasks, based on asyncio.

script.py

"""
https://docs.python.org/3/library/asyncio-task.html
https://www.youtube.com/watch?v=Xbl7XjFYsN4
"""

import time
import random
import asyncio

#######################
#  WHEN USING A NOTEBOOK

# NOTE: clash of running event loop, because jupyter already runs one
# https://markhneedham.com/blog/2019/05/10/jupyter-runtimeerror-this-event-loop-is-already-running/

# !pip3 install nest_asyncio
# import nest_asyncio
# nest_asyncio.apply()
#######################


async def say_after(what):
    delay = random.randint(1, 10)
    print(f'{what} - sleeping: {delay}')
    await asyncio.sleep(delay)
    print(what)


async def main():
    tasks = []
    for word in ['hello', 'world', 'again']:
        tasks.append(asyncio.create_task(say_after(word)))

    print(f"started at {time.strftime('%X')}")
    for task in tasks:
        await task
    print(f"finished at {time.strftime('%X')}")


# notebook simplified version:
# await main()

asyncio.run(main())