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

[Yury Selivanov]

On 2015-04-29 3:24 PM, Isaac Schwabacher wrote:
> On 15-04-29, Yury Selivanov  wrote:
>> Hi Ethan,
[..]
>> So I want to make this syntactically incorrect:
> Does this need to be a syntax error? -"hello" raises TypeError because str doesn't have a __neg__, but there's no reason a str subclass couldn't define one. "TypeError: bad operand type for unary -: 'asyncio.Future'" is enough to clear up any misunderstandings, and if someone approaching a new language construct doesn't test their code well enough to at least execute all the code paths, the difference between a compile-time SyntaxError and a run-time TypeError is not going to save them.
>


The grammar of the language should match the most common
use case.

FWIW, I've just updated the pep with a precedence table:
https://hg.python.org/peps/rev/d355918bc0d7

Yury