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

Mike Miller python-dev at mgmiller.net
Tue Apr 24 16🔞57 EDT 2018

On 2018-04-23 14:19, Barry Warsaw wrote:

Me too. Plus we already have precedence for spelling name bindings in similar constructs, such as import statements, with statements, and exceptions. It seems like a natural and Pythonic approach to extend that same spelling to binding expressions rather than introducing new, weird, symbols.

We've survived for decades without this syntax, so don't think the need is so great that we need to rush it. Let's not "jump the shark." :D

In my opinion, "EXPR as NAME" is the only version worthy enough for the readability of Python. It reads like psuedo-code, as advocates have described in the past, and already used frequently in a fuzzy, non-dogmatic manner.

The point about the potential of a bug in the "with" statement is worth serious consideration however. I don't have a problem with it, but if deemed intolerable there was an additional solution I read upthread, believe by Kirill and Steve.

Merely that, since all current use cases are in the if/while/comprehension statements, it might be a good idea to limit binding-expressions there to avoid issues/overuse elsewhere.

Well, there are a number of mitigations to the "with" issue that could be considered.

(Hoping that this is my last post on the subject.)

-Mike

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