Learn Python's AsyncIO in 15 minutes

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In this tutorial we will be looking at asyncio, which is a package from the standard Python library which allows us to do asyncronous programming. It's very easy to learn, but can be a bit tricky to master. Any way, we will be covering how to use it in less than 15 minutes!

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Simple but most essential and elegant explanations for the asyncio. Huge thanks!

WDieSmile

1:44 I think the point of 'await' is to let python do a context switch. Normal function call to sleep will also transfer control to the next line after the sleep is done, await doesn't affect that

eitantal

Thanks for the content. I think there are a few ways to do this, In the example you execute the function and then append the returned data to the list, rather than appending the function call itself to a list, Here are 2 examples:
tasks = for i in range(1, 10+1)]

await asyncio.wait(tasks)
for task in tasks:
print(task.result())

or

list_of = []
for i in range(1, 10+1):
task =
list_of.append(task)

await asyncio.gather(*list_of)

djbroake

11:10 the asyncio.sleep can be set to asyncio.sleep(0.0) and it will stil register
i know its a bit late but still might be relevant..

YoKKJoni

The `await asyncio.sleep(0.5)` isn't needed because "the task sometimes happends so fast that task.canceled is not going to be able to register the cancel in enough time"! But it's needed because `task.cancel()` doesn't actually start the cancelation but merely schedule it for cancellation. The task will be cancelled when control returns to the event loop, which happens when an await expression is encountered.

ramima

I think this video is great. Very clear.

cusematt

Thanks o this video I've decided to rewrite my synchronous data grabber (web scrapping and directly via API) based on requests to asyncio and aiohttp. Speedup was about ~2x :)

grzegorzryznar

This is arguably the best asyncio-await explanation on youtube!. thanks for keeping it simple to understand!

hillolbro

doesnt await defeat the asynchronous behavior and make it blocking? 🤒

eldebtor

Awesome vid; glad I stumbled upon this! Much cleaner than threading/mp libraries, so I want to learn this one! Why does main have to be async def main and not just def main? Also, does that mean that any functions I use in the async module must have with the async keyword in the definition?

kovi

For a noob like me this was awesome! Thank you

bogdanvelica

Nice explanation, very helpfull for me. A huge thanks !!

tonik

Can I use this to constantly check if a program is running, then make an if statement saying if the program is not running open a file and if it’s already running print the name of the current file it’s running? I’m trying to make this but with a start and stop button…

blizzred

Your voice & accent sounds a lot like Naval Ravikant
😃

pennystriker

are u using python 3.10?? bcs some function has depreced

gamingland

@7:15 isnt the function kill_time() already called before you do await.gather()

abtheminecraft

6:57 No.
Use list_of_tasks = [kill_time(i) for i in range(1000)]

hughdunc

Can you please provide source code for these videos

compscif

11:15 I am strongly against waiting like that. I would loop or create something awaitable instead, but I want to learn it, and you giving me an anti-pattern like that makes me question the usefulness of the rest :/

TojikCZ

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