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Sat Jan 6 15:59:41 EST 2018 · https://mail.python.org/pipermail/python-dev/2018-January/151644.html

On Fri, Jan 5, 2018, at 14:07, Guido van Rossum wrote:
> Yeah, but I've changed my mind on this -- I think it's needless added
> complexity that helps save one line of code in very few use cases. And you
> don't really think the PEP endorses `nonlocal foo += 1` do you?

The PEP itself is very clear about supporting "augmented assignment", even defining the grammar differently for this case (such that you can't do it with multiple names in a single statement). The grammar shown also supports "nonlocal foo = bar = baz", though the text doesn't mention this form.

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[Python-Dev] Whatever happened to 'nonlocal x = y'?