[Python-Dev] PEP 492 vs. PEP 3152, new round
Ethan Furman
ethan at stoneleaf.us
Wed Apr 29 17:29:30 CEST 2015
On 04/29, Yury Selivanov wrote:
> On 2015-04-29 5:12 AM, Greg Ewing wrote:
>> Yury Selivanov wrote:
>>> Looking at the grammar -- the only downside of the current
>>> approach is that
>>> you can't do 'await await fut'. I still think that it reads better with
>>> parens. If we put 'await' to 'factor' terminal we would allow
>>>
>>> await -fut # await (-fut)
>>
>> Is there really a need to disallow that? It would take
>> a fairly bizarre API to make it meaningful in the first
>> place, but in any case, it's fairly clear what order
>> of operations is intended without the parens.
>
> Greg, if grammar can prevent this kind of mistakes - it should.
> I like my current approach.
That's like saying we should always put parens around the number being
raised in
n ** x
because
-2**4 != (-2)**4
Please do not overuse parens. Python is not lisp, and await is not a
function, so parens should not be needed in the common case.
--
~Ethan~
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