[docs] [issue17860] subprocess docs lack info how to use output result

[anatoly techtonik]

anatoly techtonik added the comment:

On Thu, Jun 13, 2013 at 9:20 AM, Ezio Melotti <report at bugs.python.org>wrote:

>
> Also in the Python 3 docs we don't compare the current behavior with
> Python 2.
>

That's most unfortunate. Major PITA comes from attempts to port existing
code.

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