[Python-Dev] PEP 554 v2 (new "interpreters" module)

[Nick Coghlan]

On 10 September 2017 at 04:04, Nathaniel Smith <njs at pobox.com> wrote:
> On Sep 8, 2017 4:06 PM, "Eric Snow" <ericsnowcurrently at gmail.com> wrote:
>
>
>    run(code):
>
>       Run the provided Python code in the interpreter, in the current
>       OS thread.  If the interpreter is already running then raise
>       RuntimeError in the interpreter that called ``run()``.
>
>       The current interpreter (which called ``run()``) will block until
>       the subinterpreter finishes running the requested code.  Any
>       uncaught exception in that code will bubble up to the current
>       interpreter.
>
>
> This phrase "bubble up" here is doing a lot of work :-). Can you elaborate
> on what you mean? The text now makes it seem like the exception will just
> pass from one interpreter into another, but that seems impossible – it'd
> mean sharing not just arbitrary user defined exception classes but full
> frame objects...

Indeed, I think this will need to be something more akin to
https://docs.python.org/3/library/subprocess.html#subprocess.CalledProcessError,
where the child interpreter is able to pass back encoded text data
(perhaps including a full rendered traceback), but the exception
itself won't be able to be propagated.

Cheers,
Nick.

-- 
Nick Coghlan   |   ncoghlan at gmail.com   |   Brisbane, Australia