[issue20663] Introduce exception argument to iter

[Ram Rachum]

Ram Rachum added the comment:

I understand. Personally I think it'll be useful enough (and more useful to me than the builtin `sentinel`), but maybe that's just me. And I guess Terry liked it too. I don't know whether other people would like it as well.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20663>
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