[fabioz]

Well,

https://github.com/python-greenlet/greenlet

has been available for quite some time in Python (gevent probably being its most used flavor).

i.e.: just because it's not in the standard library doesn't mean it's not available (so, you can actually choose whether you'd like to use async/await or greenlets).

[azinman2]

Because it’s not in the standard library means there are various issues with compatibility. Everything needs to be designed/used for greenlets in mind. It’s not quite the same as the VM itself saying we’ve sorted it all out.

[fabioz]

Well, whenever you add threads to the mix (native or virtual threads) if you don't design for it, I don't think things pan out properly (but I guess that I agree that if someone designed with native threads going for virtual threads where the same APIs can now make IO async switch threads it's probably easier to go that route).

I must say that the main usage I personally had of greenlets didn't have it in mind initially (it was used in an existing application where making the coloring wasn't really feasible as it was a huge app already and adopting green threads was much less work).