[Python-Dev] Re: OTish: Define Protocols near consumers [was: Keeping Python a Duck Typed Language.]

On Fri, 23 Apr 2021 at 10:31, Stephen J. Turnbull wrote:

SJIS = 'shift_jisx0213'

*Now* that is a personal protocol, serving the same function of telling me "this code deals with a legacy Japanese encoding" and implementing it behind the scenes. But I don't see how that can be "defined close to its consumers", which are all over the place, including interactive sessions.

What am I missing, and how might that be applied to Python?

What you're missing, I think, is that we're talking about typing.Protocol - see here: https://docs.python.org/3/library/typing.html#typing.Protocol Paul