[Python-Dev] PEP 572: Assignment Expressions

[Guido van Rossum]

On Tue, Apr 24, 2018 at 8:24 PM, Nick Coghlan <ncoghlan at gmail.com> wrote:

> I also think it would be good for the PEP to spell out the following
> semantic invariant for code running in a regular namespace:
>
>     _rhs = expr
>     assert (target := _rhs) is _rhs and target is _rhs
>
> It's the restriction to single names as targets that makes it possible
> to impose such a strong assertion about what the syntax means.
>

Can you elaborate? I don't understand what you mean by this.

-- 
--Guido van Rossum (python.org/~guido)
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