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

Baptiste Carvello devel at baptiste-carvello.net
Thu Jun 28 08:05:26 EDT 2018

Le 28/06/2018 à 01:31, Greg Ewing a écrit :

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.

Comprehensions with side effects feel scary indeed. But I could see myself using some variant of the "cumsum" example (for scientific work at the command prompt):

x=0; [x:=x+i for i in range(5)]

Here the side effects are irrelevant, the "x" variable won't be reused. But it needs to be initialized at the start of the comprehension.

I would happily get rid of the side-effects, but then what would be a non-cryptic alternative to the above example?

Baptiste

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