[Python-Dev] PEP 563: Postponed Evaluation of Annotations

[Brett Cannon]

On Sun, Nov 12, 2017, 10:22 Koos Zevenhoven, <k7hoven at gmail.com> wrote:

> On Nov 12, 2017 19:10, "Guido van Rossum" <guido at python.org> wrote:
>
> On Sun, Nov 12, 2017 at 4:14 AM, Koos Zevenhoven <k7hoven at gmail.com>
> wrote:
>
>> So actually my question is: What should happen when the annotation is
>> already a string literal?
>>
>
> The PEP answers that clearly (under Implementation):
>
> > If an annotation was already a string, this string is preserved
> > verbatim.
>
>
> Oh sorry, I was looking for a spec, so I somehow assumed I can ignore the
> gory implementation details just like I routinely ignore things like
> headers and footers of emails.
>
> There's two thing I don't understand here:
>
> * What does it mean to preserve the string verbatim? No matter how I read
> it, I can't tell if it's with quotes or without.
>
> Maybe I'm missing some context.
>

I believe the string passes through unchanged (i.e. no quotes). Think of
the PEP as simply turning all non-string annotations into string ones.

-brett


>
> -- Koos (mobile)
>
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