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

Chris Angelico rosuav at gmail.com
Sat Nov 22 23:23:20 CET 2014

On Sun, Nov 23, 2014 at 8:03 AM, Ron Adam <ron3200 at gmail.com> wrote:

Making comprehensions work more like generator expressions would, IMO, imply making the same change to all for loops: having a StopIteration raised by the body of the loop quietly terminate the loop.

I'm not suggesting making any changes to generator expressions or for loops at all. They would continue to work like they currently do.

But if you're suggesting making list comps react to StopIteration raised by their primary expressions, then to maintain the correspondence between a list comp and its expanded form, for loops would have to change too. Or should that correspondence be broken, in that single-expression loop constructs become semantically different from statement loop constructs?

ChrisA

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