[Python-Dev] Return from generators in Python 3.2

[Nick Coghlan]

On Fri, Aug 27, 2010 at 8:31 AM, Yury Selivanov <yselivanov at gmail.com> wrote:
> All this proposal is suggesting is to replace SyntaxError with
> GeneratorReturn (or StopIteration).  I'd classify is as a minor change
> than some special refactoring that may fall under the moratorium.  Correct
> me if I'm wrong.

It's either a new builtin or affects the API of an existing builtin,
and it is moving something from a compile time error to a runtime
error. Things that fall under the moratorium aren't "special
refactorings" - they're anything that affects the builtins or the
language syntax, so trying to separate out this one part of PEP 380
fails on both counts.

Coroutine programmers have lived with the status quo for years
already, putting up with it for a couple more until PEP 380 goes in
isn't going to hurt them all that much.

On the GeneratorReturn vs StopIteration front, adding a new builtin
exception is a big deal. "Newbie programmers might not notice that
their return statement isn't doing anything" isn't a particularly good
justification for adding one.

Cheers,
Nick.

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