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

MRAB python at mrabarnett.plus.com
Wed Nov 19 21:48:39 CET 2014

On 2014-11-19 20:10, 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 PEP says """any generator that depends on an implicitly-raised StopIteration to terminate it will have to be rewritten to either catch that exception or use a for-loop"""

Shouldn't that be "... explicitly-raised ...", because returning raises StopIteration implicitly? ("raise StopIteration" is explicit)

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