> On 25 Apr, 2018, at 1:24 PM, Chris Angelico <ros...@gmail.com> wrote: > > On Thu, Apr 26, 2018 at 6:21 AM, Łukasz Langa <luk...@langa.pl> wrote: >> := also goes against having one obvious way to do it. Since it's an >> expression, >> it can also be placed on its own line or in otherwise weird places like >> function call arguments. I anticipate PEP 8 would have to be extended to >> explicitly discourage such abuse. Linters would grow rules against it. This >> is >> noise. > > Does this argument also apply to the if/else expression? Do linters > need rules to advise against people writing code like: > > print(x) if x is None else print(y) > > ? It's perfectly legal to write code like this. But I don't see people > abusing this sort of thing.
Ternary expressions are different because their flow is deliberately different from a regular if statement. It's also different from the C equivalent. `:=` on the other hand is deciptively similar to `=`. But yeah, I think worrying about abuse of the feature is a red herring. The gist of my criticism of your PEP is about the decreased balance in information density. -- Ł
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