> This is Python3 as most of us wanted it to be.
> Valid Python2 is Grumpy already.
> It compiles existing Python2 AND offers a legitimate upgrade from CPython at the same time.
> As far as all of the lost C extensions? You won't need them
None of the statements are true. You seem to be very confused what Grumpy can and can't do, and what the need of actual Python developers are.
The only benefit of Grumpy is speed (I don't think go "interop" counts). Now, that's a pretty big benefit for some, but comes with significant drawbacks and probably always will. Even though CPython is only the reference implementation, many clever people have worked to make it faster. Getting rid of the GIL is also very difficult. The easiest way to gain speed is to limit Python to a subset of features and then optimise for that. While this is a fair approach, hailing it as the future of Python is terribly misguided.
Grumpy proves Python2 is where the action is at. Everyone wanted a speed improvement with a new Python, that's the ultimate carrot.. instead Python3 was and still is in some ways slower than 2. Other than exec, eval and C-extensions, Python2 is valid Grumpy.
You didn't provide any reasoning or proof that my points, which were just reiterated, were false. If you're going to "port" anywhere from Python2, removing C extensions (which no language should have to be dependent upon anyway, so it's an improvement) and exec/eval usage is a bigger win than Python3.
The future of Python is what the users decide, not what the PSF decided. I recognize there's a lot of confusion and propaganda surrounding that. This is open source, not top-down control.
One thing is clear with all these new compilers/runtimes, you want to be writing Python2 syntax because that's where all the action is. I hope Grumpy succeeds and new features are added and becomes it's own ecosystem that plays nicely with Go code. These folks at Google have really done what Guido & Co should've done.
This is Python3 as most of us wanted it to be, it's worth rewriting all your code for... but you don't even have to do that. Valid Python2 is Grumpy already. I don't know what else I'd want. It compiles existing Python2 AND offers a legitimate upgrade from CPython at the same time.
As far as all of the lost C extensions? You won't need them with the performance that the Go runtime has. That's been the answer all this time, not maintaining C-extension compatibility.
They nailed this thing, it's the answer to "what's the future of Python?" that everyone has been wondering for the past 9 years.