The new postponed annotations have an unexpected interaction with
dataclasses. Namely, you cannot get the type hints of any of the data
classes methods.
For example, I have some code that inspects the type parameters of a
class's `__init__` method. (The real use case is to provide a default
serial
This is a good catch -- thanks for bringing it up. I'm adding Eric Smith
(author of dataclasses) and Ivan Levkivskyi (co-author of typing) as well
as Łukasz Langa (author of PEP 563) to the thread to see if they have
further insights.
Personally I don't think it's feasible to change PEP 563 to use
On 9/22/2018 12:41 PM, Guido van Rossum wrote:
This is a good catch -- thanks for bringing it up. I'm adding Eric Smith
(author of dataclasses) and Ivan Levkivskyi (co-author of typing) as
well as Łukasz Langa (author of PEP 563) to the thread to see if they
have further insights.
I don't see
On Sat, Sep 22, 2018 at 11:29 AM Eric V. Smith wrote:
> I think this problem is endemic to get_type_hints(). I've never
> understood how you're supposed to use the globals and locals arguments
> to it, but this works:
>
> print(get_type_hints(Bar.__init__, globals()))
>
> as does:
>
> print(get_t
On Sat, Sep 22, 2018 at 3:11 PM Guido van Rossum wrote:
[..]
> Still, I wonder if there's a tweak possible of the globals and locals used
> when exec()'ing the function definitions in dataclasses.py, so that
> get_type_hints() gets the right globals for this use case.
>
> It's really tough to be
