'How Do Python Coroutines Work?'

At Open Source Bridge and PyGotham in 2015, I demonstrated that you can code a Python 3 async framework in about a half hour. I start the demo by writing a callback-based async framework, built on non-blocking sockets and a simple event loop. Then I adapt the framework to use generator-based coroutines, which are cleaner than callbacks but still more efficient than threads for async I/O.

For more information on this topic I've made you a page of links:

[SecularSerenity]

It's very hard to find even slightly esoteric Python tutorials, let alone someone with a great understanding and who is very well-spoken. Thank you for this! I've been using Select() for the past few years, but I'm moving to Python3 and I'm trying to find videos that aren't 'beginner-level' to put it lightly. This is fantastic!

[Broswhoknowstuff]

I followed and worked it all out. Thanks for lesson although a while ago...motivating. Coding at 64 years of age and still ticking strong!

[kumarrohit]

Some of the tutorials are classic. For me this is one of them.

[JumpingCow]

A very clear explanation of async programming fundamentals in Python. Superb!

[bchoor]

Jesse, please do more tutorials. This is a great especially for such a complex concept. I've watched videos from Beazley and Hettinger on this topic, which were great in their own respect; but yours actually finally hit it home for me. Thanks!

[combatLaCarie]

Loved the video, thanks for this! One of the best Python tutorial presenters I've seen!

[kevinfairweather]

I have absolutely no idea whats going on but i genuinely enjoyed watching it !

[leealvin]

This tutorial is very useful to me, and it helps me better understand the concept of coroutines by writing code. thank you jesse

[pward]

That moment when you've just learned something new and interesting then it turns out to be the intro.

[StevenSmith-qzzg]

Cool! I did apply at MongoDB. I'm a recent graduate of 2 year CIS - Software Application Dev AAS degree, though I've been technically programming since I was 9 using basic on a commodore 64. lol. Anyways, thank you for the video! I'll be looking for more. I've subscribed. Looking for any good, informational video with Python and anything (database, networking, anything I don't know yet (which is plenty!!) etc) Thank you again. :)

[kellypainter]

My brain just melted while waiting for next() to be called

[zzzzzz...]

Geez...I thought I was ready for advanced but um I think I am going to go back to the basics, xd.

[sdalmudhafer]

that was really informative ! Thank you, Sir for posting a great video.

[IcarianVX]

Thanks man, this was explained very well and makes a lot of sense.

[igormiholic]

wow, 45 minutes went by so fast... great tutorial, thanks a lot!

[LaVidaEnUnaGota]

But when you make the first get, can you try to set keepalive, like for the second request, you don't need to open socket again

[EazyTutor]

It's very good to learn A.Jesse. Thanks a lot for the video demonstration...

[alaypatel]

Amazing insight into coroutines, thank you for the tutorial.
However, is it a good idea to use coroutines for CPU intensive work? I did read somewhere, with asyncio, one can create coroutines with ProcessPoolExecuters. It would be great to have an insight into how that works.
Thank you.

[ArturdeSousaRocha]

Great tutorial, and there is a nice select()/selectors tutorial hiding in there.

[attilamolnar]

Instead of using a selector wouldn't be easier to just put "s.send(request.encode())" and the receiving loop into the try exception after s.connect('localhost', 5000') ?
Edit:
I got it. This way we do not bother the OS with failing read-write attempts.