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