It is a tricky issue. How deep do you go?what if you are chaining several
of the itertools? Seems like we're entering a semantic sinkhole here.

Deepcopy would be too deep...
The original copy support in these objects stems from the desire to support
pickling.

On 1 Apr 2017 16:12, "Raymond Hettinger" <report@bugs.python.org> wrote:

>
> Raymond Hettinger added the comment:
>
> Serhiy, feel free to take this in whatever direction you think is best.
>
> ----------
> assignee:  -> serhiy.storchaka
>
> _______________________________________
> Python tracker <report@bugs.python.org>
> <http://bugs.python.org/issue29897>
> _______________________________________
>