[docs] [issue13557] exec of list comprehension fails on NameError

[Florent Xicluna]

Florent Xicluna <florent.xicluna at gmail.com> added the comment:

Issue #11796 marked as duplicate of this one.

However the issue described in #11796 does not involve exec/execfile.
It is about scopes for list comprehension like this one.

Another doc patch should probably be written to cover the case described in #11796 too.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue13557>
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