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Python asyncio: Summary & Recap

Hands-On Python 3 Concurrency With the asyncio Module Chyld Medford 01:43

Recap of everything you’ve covered in this course. In this course, you learned:

What asyncio is and when you can use it in your projects
How to set up a project
What generators are
What coroutines are
How to use asyncio to build a real world application

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00:00 Congratulations on finishing! Now that you’re done, what I’d like to do is go back over the objectives. So, number one, what is asyncio? Once again, I mentioned that asyncio is a library in Python that’s used in case you have an IO bound-application—you have an app and it’s slow and it’s slow because you’re doing a lot of IO.

00:20 You’re talking to a database, you’re talking to a file system, you’re talking to some website and it’s slow. asyncio can definitely help the performance with that.

00:27 We set up this project together, I showed you what generators are using the yield keyword. We set up coroutines, which are similar to generators. Remember, generators are producers; coroutines are like consumers.

00:40 Coroutines are asynchronous, you have to use the async keyword and also await—the async/await keywords.

00:47 And then asynchronous generators are generators that produce values,

00:51 but produce them asynchronously, so you don’t know how often that they will actually produce those values. And those async generators are a combination of generators and coroutines. Then finally, we built a real-world application, which went out to some website and requests n number of random numbers from this website, and then brought it back and then used it in our application.

01:13 But we created, I think, nearly 30 coroutine tasks that seemed to run essentially in parallel, and our speed on it was actually really fast, versus something that, if you were to do them sequentially one after the other after the other, would have been a lot slower.

01:29 So, hopefully, this tutorial helped you out with asyncio and maybe it gave you some ideas of how you can use asyncio in your project to increase your performance. Thank you.

mahlenius on June 30, 2020

Great job explaining this asycnio lib. Enjoyed the demos and actually typed along with them so I could try/tinker myself. The “real world” example at the end was very useful for me. Thanks!

techdiverdown on July 13, 2020

Very well done, i enjoyed the presentation and I learned some things. The last example was useful.

Sid Price on July 25, 2020

Clear and concise … thank you

Ghani on Oct. 30, 2020

Very good course; thank you!

ulascilingir on Dec. 6, 2020

Thank you, great help on asyncio!

sevush on June 16, 2021

I think http and JSON are so well understood that I think you could drop some links for JSON and HTTP basics. Otherwise, very helpful overall.

JoeFred on April 23, 2023

The website used in the final two videos only allows one call per minute. So, the code will not work as the second call has a response value of “None”.

aromagosa on May 22, 2023

I am trying to take profit of this asyncio on TCP/IP communication with multiple instruments, as many times the instruments are measuring during n sec buffering data(And right now I wait for the operation to be completed) I will try to call the Init measurement with a coroutine, something like:

measure_task = asyncio.to_thread(self.resource.write("INIT;*OPC?"))
[...] # operations done on other instruments
await measure_task
# when task is awaited I can read the instrument buffer
measure = self.resource.query("FETC?").strip()

I think this will be a good use of this asyncio. Are there better solutions than this?

patrickwregan on Nov. 1, 2024

I feel I got a good introduction to asyncio, coroutines and generators in this tutorial. I wanted to note that, as of 11/1/2024, the qrng site limites access of their website via json calls to 1 per minute so the multiple call example does not work.

jaden li on July 10, 2026

Well done. The concept is explained clearly.

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