On Thu, Dec 2, 2021 at 6:57 PM Stephan Richter <stephan.rich...@gmail.com> wrote:
> So maybe this is my time to chime in. I have used annotations for runtime > behavior. My primary use case is an injection library that I wrote. Does it work with __future__ annotations? -CHB > It allows > something along the lines of: > > class IMyService(IService): > pass > > @inject > def call_something(arg1: str, arg2: int, svc: IMyService = None): > assert svc is not None > # do stuff... > > At runtime the `inject()` decorator will scan the function signature and > insert an instance of `IMyService` based on a registry lookup. (We use > zope.component utilities, but that's an implementation detail.) When > testing, > one can simply pass a mock version of the service. > > Using the mypy-zope plugin, the above also passes all mypy type checking. > > It is a simple pattern in terms of annotation but a very effective pattern > that mimics other injection systems in Java and TypeScript (Angular). We > have > used it for a few years now and like it a lot. > > Regards, > Stephan > > On Monday, November 29, 2021 6:00:04 PM EST Barry Warsaw wrote: > > On Nov 26, 2021, at 01:13, Paul Moore <p.f.mo...@gmail.com> wrote: > > > I'd therefore interpret Barry's plea as being for *anyone* with a use > > > for annotations to provide their feedback (at least, anyone who > > > accepts that annotations are types), with particular emphasis on > > > people who want to use the types declared in annotations to affect > > > runtime behaviour, as that's the most under-represented group at the > > > moment (and it's not clear whether it's under-represented because > > > there aren't many such uses, or because the users aren't being heard > > > from). > > > > Spot on. > > > > -Barry > > > -- > Stephan Richter > Entrepreneur & Geek > > > _______________________________________________ > Python-Dev mailing list -- python-dev@python.org > To unsubscribe send an email to python-dev-le...@python.org > https://mail.python.org/mailman3/lists/python-dev.python.org/ > Message archived at > https://mail.python.org/archives/list/python-dev@python.org/message/XRJJ4ZMOQJXOTRFT3FQ25QXHXOKBVXKP/ > Code of Conduct: http://python.org/psf/codeofconduct/ > -- Christopher Barker, PhD (Chris) Python Language Consulting - Teaching - Scientific Software Development - Desktop GUI and Web Development - wxPython, numpy, scipy, Cython
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