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Sun Jun 24 19:30:24 EDT 2018 · https://mail.python.org/pipermail/python-dev/2018-June/154051.html

Guido van Rossum wrote:
> Greg seem to be +0 or better for (a)

Actually, I'm closer to -1 on (a) as well. I don't like := as a
way of getting assignment in an expression. The only thing I would
give a non-negative rating is some form of "where" or "given".

Brief summary of reasons for disliking ":=":

* Cryptic use of punctuation

* Too much overlap in functionality with "="

* Asymmetry between first and subsequent uses of the bound value

* Makes expressions cluttered and hard to read to my eyes

-- 
Greg

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[Python-Dev] Informal educator feedback on PEP 572 (was Re: 2018 Python Language Summit coverage, last part)