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Tue Oct 13 11:26:09 EDT 2015 · https://mail.python.org/pipermail/python-dev/2015-October/141894.html

"R. David Murray" <rdmurray at bitdance.com> writes:

> On Tue, 13 Oct 2015 14:59:56 +0300, Stefan Mihaila
> <stefanmihaila91 at gmail.com> wrote:
>> Maybe it's just python2 habits, but I assume I'm not the only one
>> carelessly thinking that "iterating over an input a second time will 
>> result in the same thing as the first time (or raise an error)".
>
> This is the way iterators have always worked.

It does raise the question though of what working code it would actually
break to have "exhausted" iterators raise an error if you try to iterate
them again rather than silently yield no items.

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[Python-Dev] Rationale behind lazy map/filter