[Python-Dev] PEP 479: Change StopIteration handling inside generators (original) (raw)

Alexander Belopolsky alexander.belopolsky at gmail.com
Tue Nov 25 01:21:32 CET 2014

On Wed, Nov 19, 2014 at 3:10 PM, Guido van Rossum <guido at python.org> 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.

I think the PEP should also specify what will happen if the generator's next() method is called again after RuntimeError is handled. The two choices are:

  1. Raise StopIteration (current behavior for all exceptions).
  2. Raise RuntimeError (may be impossible without gi_frame).

I think choice 1 is implied by the PEP. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.python.org/pipermail/python-dev/attachments/20141124/2fb96433/attachment.html>

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