Issue 46342: Make @final introspectable at runtime (original) (raw)

Issue46342

Created on 2022-01-11 12:10 by JelleZijlstra, last changed 2022-04-11 14:59 by admin. This issue is now closed.

Messages (2)
msg410298 - (view)	Author: Jelle Zijlstra (JelleZijlstra) *	Date: 2022-01-11 12:10
Currently, @typing.final is implemented as an identity function, which makes it impossible for type checkers that look at runtime objects to support it. I propose that we implement it as something like: def final(f): try: f.__final__ = True except AttributeError: pass # in case it is used on an object that doesn't support setting attributes return f I will submit a PR implementing this idea.
msg410424 - (view)	Author: Guido van Rossum (gvanrossum) *	Date: 2022-01-12 19:38
New changeset 0bbf30e2b910bc9c5899134ae9d73a8df968da35 by Jelle Zijlstra in branch 'main': bpo-46342: make @typing.final introspectable (GH-30530) https://github.com/python/cpython/commit/0bbf30e2b910bc9c5899134ae9d73a8df968da35