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

Greg Ewing greg.ewing at canterbury.ac.nz
Wed Jun 27 19:31:43 EDT 2018

Steven D'Aprano wrote:

The very first motivating example for this proposal came from a comprehension.

I think it is both unfortunate and inevitable that the discussion bogged down in comprehension-hell.

I think the unfortunateness started when we crossed over from talking about binding a temporary name for use within a comprehension or expression, to binding a name for use outside the comprehension or expression where it's bound.

As long as it's for internal use, whether it's in a comprehension or not isn't an issue.

Tim Peters has also given a couple of good examples of mathematical code that would benefit strongly from this feature.

Going back a few months now, they were the examples that tipped me over

Well, I remain profoundly unconvinced that writing comprehensions with side effects is ever a good idea, and Tim's examples did nothing to change that.

-- Greg

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