Learn Python's AsyncIO in 15 minutes

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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Documentation:
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[@WDieSmile]

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

[@eitantal726]

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

[@djbroake9810]

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 = [loop.create_task(kill_time(i)) 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 = asyncio.create_task(kill_time(i)) list_of.append(task) await asyncio.gather(*list_of)

[@YoKKJoni]

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..

[@valorantaccount462]

thanks really understood the concept.

[@artem_isakow]

Very clear 👌

[@emailvinz]

Very clear, thank you very much !

[@grzegorzryznar5101]

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 :)

[@vnikolayev]

Great video, thanks!

[@ramima6465]

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.

[@cusematt23]

I think this video is great. Very clear.

[@umbertoarreghini9307]

👏Clear and concise

[@supundasanthakuruppu3496]

This was very helpful. Thank you.

[@alexiswiftrock]

Thanks for this exposition 👍

[@skyisthelimpet]

Thanks for the explanation

[@Arocksy]

Thanks for a simple explanation!

[@bogdanvelica]

For a noob like me this was awesome! Thank you

[@kovi5758]

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?

[@eldebtor6973]

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

[@eugenmalatov5470]

i think the explanation is wrong. Await starts a async coroutine, nothing to do with waiting afaik.

[@joakker8820]

If I understand correctly, if you await, the execution will continue in another coroutine, which could be the one you just created, or another

[@hillolbro]

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

[@findritesh]

great tutorial!

[@blizzred2143]

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…

[@gamingland2074]

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

[@tonik04]

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

[@sc0820]

very nice

[@abtheminecraft]

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

[@e_a_r_t_h_m_a_n]

coroutines (any function with `yield` or `await` inside) should be `extracted` from a function first by a call syntax. But this call is not a call, it just returns a `coroutine` object.

[@pennystriker]

Your voice & accent sounds a lot like Naval Ravikant 😃

[@hughdunc]

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

[@Slay_and_Play]

Why do you need list comprehension versus what he had?

[@compscif5032]

Can you please provide source code for these videos

[@Indently]

I don’t have source code for these videos

[@__lasevix_]

@@Indently you delete all the example files after writing ?

[@Indently]

@@__lasevix_ Yeah, I don't share source code in general for non-project videos

[@alexiswiftrock]

Just follow along in practice. Not everything has to be a handout.

[@TojikCZ]

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 :/

[@Indently]

You can be strongly against whatever you want. The sleep can also be set to 0 if you want, but you need to provide your script some context to be able to perform a switch or it never will.

[@trzztrzz2477]

fuoco frigiteli y adizo

[@Alex-bw8wr]

Not super useful 😢

[@Indently]

Thank you for the useful comment 😉