[Python-ideas] Introduce collections.Reiterable

[Nick Coghlan]

On 19 Sep 2013 18:59, "Neil Girdhar" <mistersheik at gmail.com> wrote:
>
> Well, generators are iterable, but if you write a function like:
>
> def f(s):
>      for x in s:
>              do_something(x)
>      for x in s:
>              do_something_else(x)
>
> x should not be a generator.  I am proposing adding a function to
itertools like auto_reiterable that would take s and give you an reiterable
in the most efficient way possible.

Generators *are* iterators, though, so they fail the second half of the
check. Hence my question - is there any obvious case where "iterable but
not an iterator" gives the wrong answer?

Cheers,
Nick.

>
>
> On Thu, Sep 19, 2013 at 4:32 AM, Nick Coghlan <ncoghlan at gmail.com> wrote:
>>
>> My question would be, does the new class add anything that isn't
>
>
>
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