[Python-Dev] PEP 572: Assignment Expressions

[Chris Angelico]

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