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Thu Apr 30 00:54:49 CEST 2015 · https://mail.python.org/pipermail/python-dev/2015-April/139655.html

Greg,

On 2015-04-29 6:46 PM, Greg Ewing wrote:
> Yury Selivanov wrote:
>> I'm not sure
>> why Greg is pushing his Grammar idea so aggressively.
>
> Because I believe that any extra complexity in the grammar
> needs a very strong justification. It's complexity in the
> core language, like a new keyword, so it puts a burden on
> everyone's brain.
>
> Saying "I don't think anyone would ever need to write this,
> therefore we should disallow it" is not enough, given that
> there is a substantial cost to disallowing it.
>
> If you don't think there's a cost, consider that we *both*
> seem to be having trouble predicting the consequences of
> your proposed syntax, and you're the one who invented it.
> That's not a good sign!

Sorry, but I'm not sure where & when I had any troubles
predicting the consequences..

Please take a look at the updated PEP.  There is a
precedence table there + motivation.

Yury

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[Python-Dev] PEP 492 vs. PEP 3152, new round