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Showing content from https://mail.python.org/pipermail/python-dev/2017-November/150796.html below:

[Python-Dev] Tricky way of of creating a generator via a comprehension expression

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Guido van Rossum wrote:
> the extra scope is now part of the language definition. 
> It can't be removed as a "bug fix".

Does anyone actually rely on the scope-ness of comprehensions
in any way other than the fact that it prevents local variable
leakage?

If not, probably nobody would notice if it were changed back.

-- 
Greg

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