[Python-Dev] [SPAM: 3.000] [issue11682] PEP 380 reference implementation for 3.3

[Paul Moore]

On 9 November 2011 23:11, Guido van Rossum <guido at python.org> wrote:
> On Wed, Nov 9, 2011 at 2:13 PM, Greg Ewing <greg.ewing at canterbury.ac.nz> wrote:
>> In my current grammar, it's a syntax error on its own,
>> but 'f(yield from x, y)' parses as 'f((yield from x), y)',
>> which seems like a reasonable interpretation to me.
>
> Once you realize that "yield from x, y" has no meaning, sure. But
> without thinking deeper about that I can't prove that we'll never find
> a meaning for it. We had a similar limitation for "with a, b:" --
> initially it was illegal, eventually we gave it a meaning.

Without the context of this thread, my immediate thought would be that
yield from x, y is some sort of chaining construct.

But I have no vested interest in arguing for this, it's just for information.
Paul