[Python-Dev] Is static typing still optional?

Chris Barker chris.barker at noaa.gov
Tue Dec 26 13:49:53 EST 2017

On Sat, Dec 23, 2017 at 5:54 PM, Nick Coghlan <ncoghlan at gmail.com> wrote:

> I still wonder about the "fields *must* be annotated" constraint though. I
> can understand a constraint that the style be *consistent* (i.e. all fields
> as annotations, or all fields as field instances), since that's needed to
> determine the field order, but I don't see the problem with the "no
> annotations" style otherwise.

IIUC, without annotations, there is no way to set a field with no default.

And supporting both approaches violates "only one way to do it" in, I
think, a confusing manner -- particularly if you can't mix and match them.

Also, could does using class attributes without annotations make a mess
when subclassing? -- no I haven't thought that out yet.


> Cheers,
> Nick.


Christopher Barker, Ph.D.

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Chris.Barker at noaa.gov
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