On Mon, Jun 11, 2018 at 3:10 PM Rob Cliffe via Python-Dev <
python-dev@python.org> wrote:
> Skip, I think you have misunderstood the point I was making. It was
> not whether the loop variable should leak out of a list comprehension.
> Rather, it was whether a local variable should, so to speak, "leak into"
> a list comprehension. And the answer is: it depends on whether the code
> is executed normally, or via exec/eval. Example:
>
> def Test():
> x = 1
> print([x+i for i in range(1,3)]) # Prints [2,3]
> exec('print([x+i for i in range(1,3)])') # Raises NameError (x)
> Test()
>
> I (at least at first) found the difference in behaviour surprising.
>
Change 'def' to 'class' and run it again. You'll be even more surprised.
_______________________________________________
Python-Dev mailing list
Python-Dev@python.org
https://mail.python.org/mailman/listinfo/python-dev
Unsubscribe:
https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
