On 04/30, Yury Selivanov wrote:
> On 2015-04-30 1:56 PM, Ethan Furman wrote:
> I still want to see where my current grammar forces to use
> parens. See [1], there are no useless parens anywhere.
--> await -coro()
SyntaxError
--> await (-coro()) # not a SyntaxError, therefore parens are
# forced
>> In other words, a SyntaxError is nat any clearer than "AttributeError: obj
>> has no __neg__ method" and it's not any clearer than "AwaitError: __neg__
>> returned not-awaitable". Those last two errors tell you exactly what you
>> did wrong.
>
> This is debatable. "obj has no __neg__ method" isn't obvious
> to everyone (especially to those people who aren't using
> operator overloading).
Good news! The error there is actually
--> -object()
TypeError: bad operand type for unary -: 'object'
Which is definitely clear, even for those who don't do operator overloading.
--
~Ethan~
_______________________________________________
Python-Dev mailing list
Python-Dev@python.org
https://mail.python.org/mailman/listinfo/python-dev
Unsubscribe:
https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
