[Python-Dev] PEP 572: Assignment Expressions (original) (raw)

Guido van Rossum guido at python.org
Fri Apr 20 16:59:47 EDT 2018

Does the PEP currently propose to allow that horrible example? I thought Tim Peters successfully pleaded to only allow a single "NAME := ". You don't have to implement this restriction -- we know it's possible to implement, and if specifying this alone were to pull enough people from -1 to +0 there's a lot of hope!

On Fri, Apr 20, 2018 at 1:12 PM, Chris Angelico <rosuav at gmail.com> wrote:

On Sat, Apr 21, 2018 at 6:04 AM, David Mertz <mertz at gnosis.cx> wrote: > It's horrors like this: > > g(items[idx] := idx := f()) > > That make me maybe +0 if the PEP only allowed simple name targets, but > decisively -1 for any assignment target in the current PEP.

But that's my point: you shouldn't need to write that. Can anyone give me a situation where that kind of construct is actually useful? Much more common would be to use := inside the square brackets, which makes the whole thing a lot more sane. You can ALWAYS write stupid code. Nobody can or will stop you. ChrisA

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