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Fri Dec 22 15:29:48 EST 2017 · https://mail.python.org/pipermail/python-dev/2017-December/151446.html

There name Data seems very intuitive to me without suggesting type
declaration as Any does (but it can still be treated as a synonym by actual
type checkers)

On Dec 22, 2017 12:12 PM, "Paul Moore" <p.f.moore at gmail.com> wrote:

> On 22 December 2017 at 19:50, Gregory P. Smith <greg at krypto.org> wrote:
>
> > 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).
>
> That sounds like a nice simple proposal. +1 from me.
>
> Documentation can say that variables should be annotated with "Data"
> to be recognised by the decorator, and if people are using type
> annotations an actual type can be used in place of "Data" (which acts
> the same as typing.Any. That seems to me to describe the feature in a
> suitably type-hinting-neutral way, while still making it clear how
> data classes interact with type annotations.
>
> Paul
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[Python-Dev] Is static typing still optional?