[Python-Dev] Assignment expression and coding style: the while True case

Ivan Pozdeev vano at mail.mipt.ru
Thu Jul 5 07:22:46 EDT 2018

On 05.07.2018 9:47, Steven D'Aprano wrote:
> On Thu, Jul 05, 2018 at 12:51:37AM +0200, Victor Stinner wrote:
>> I propose to start the discussion about "coding style" (where are
>> assignment expressions appropriate or not?) with the "while True"
>> case.
> We don't even have an official implementation yet, and you already want
> to start prescribing coding style? We probably have months before 3.8
> alpha comes out.

This is an excellent way to look at the picture with a user's eyes. You 
immediately see what parts of the design lend themselves well to 
practice and what don't, which details are unclear, which additional 
features are missing (note how he revealed the lack of tuple unpacking) 
-- by all means, something to do at the design stage, before doing the 

It's also a testimony of how much an improvement a feature will _really_ 
be -- something that contrived examples can't tell.

I salute Victor for such an enlightemed idea and going for the trouble 
to carry it out!

> I appreciate your enthusiasm, but what's the rush? Give people a chance
> to play with the syntax in the REPL before making Thou Shalt and Thou
> Shalt Not rules for coding style and making wholesale changes to the std
> lib.
> This topic has been argued and argued and argued on two mailing lists
> for over four months. Let's take a couple of weeks to catch our breath,
> wait for the implementation to actually hit the 3.8 repo, before trying
> to prescribe coding style or thinking about which parts of the std lib
> should be refactored to use it and which shouldn't.
> There is no need to rush into making changes. Let them happen naturally.


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