[Python-Dev] PEP 479: Change StopIteration handling inside generators

[Benjamin Peterson]

On Wed, Nov 19, 2014, at 15:10, Guido van Rossum wrote:
> There's a new PEP proposing to change how to treat StopIteration bubbling
> up out of a generator frame (not caused by a return from the frame). The
> proposal is to replace such a StopIteration with a RuntimeError (chained
> to
> the original StopIteration), so that only *returning* from a generator
> (or
> falling off the end) causes the iteration to terminate.
> 
> The proposal unifies the behavior of list comprehensions and generator
> expressions along the lines I had originally in mind when they were
> introduced. It renders useless/illegal certain hacks that have crept into
> some folks' arsenal of obfuscated Python tools.
> 
> In Python 3.5 the proposed change is conditional on:
> 
>     from __future__ import replace_stopiteration_in_generators

Drive-by comment: This seems like a terribly awkward name. Could a
shorter and sweeter name not be found?