[Python-Dev] Is static typing still optional?

[Gregory P. Smith]

On Fri, Dec 22, 2017 at 11:40 AM Chris Barker <chris.barker at noaa.gov> wrote:

> On Fri, Dec 22, 2017 at 8:49 AM, Brett Cannon <brett at python.org>
>
But I think the key point I want to make is Guido chose dataclasses to
>> support using the type hints syntax specifically over how attrs does
>> things, so I don't see this thread trying to work around that going
>> anywhere at this point since I haven't seen a solid alternative be proposed
>> after all of this debating.
>>
>
> And the PEP has been approved.
>
> So the actionable things are:
>
> Writing good docs
>
> Converging on a "recommended" way to do non-typed dataclass fields.
>

My preference for this is "just use Any" for anyone not concerned about the
type.  But if we wanted to make it more opaque so that people need not
realizing that they are actually type annotations, I suggest adding an
alias for Any in the dataclasses module (dataclasses.Data = typing.Any)

from dataclasses import dataclass, Data

@dataclass
class Swallow:
    weight_in_oz: Data = 5
    laden: Data = False
    species: Data = SwallowSpecies.AFRICAN

the word "Data" is friendlier than "Any" in this context for people who
don't need to care about the typing module.

We could go further and have Data not be an alias for Any if desired (so
that its repr wouldn't be confusing, not that anyone should be looking at
its repr ever).

-gps


>
> And that should be decided in order to write the docs, (and probably
> should be in the PEP).
>
> -CHB
>
>
> --
>
> Christopher Barker, Ph.D.
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>
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