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

Ethan Furman ethan at stoneleaf.us
Tue Apr 17 11:12:09 EDT 2018

On 04/17/2018 06:26 AM, Paul Moore wrote:

I should also point out that I remain -0 on this proposal (I'd already said this on python-ideas, but I should probably repeat it here). For me, the use cases are mostly marginal, and the major disadvantage is in having two forms of assignment. Explaining to a beginner why we use a := b in an expression, but a = b in a statement is going to be a challenge.

I don't see the challenge: They are different because '=' came first, but using '=' in an expression is a common source of bugs, so there we use ':=' instead.

-- Ethan

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