I'd propose that we relegate `__trunc__` to the same status as `__floor__` and `__ceil__`: that is, have `__trunc__` limited to being support for `math.trunc`, and nothing more. Right now the `int` constructor potentially looks at all three of `__int__`, `__index__` and `__trunc__`, so the proposal would be to remove that special role of `__trunc__` and reduce the `int` constructor to only looking at `__int__` and `__index__`.
Obviously that's a backwards incompatible change, but a fairly mild one, with an obvious place to insert a `DeprecationWarning` and a clear transition path for affected code: code that relies on `int` being able to use `__trunc__` would need to add a separate implementation of `__int__`. (We made this change recently for the `Fraction` type in https://bugs.python.org/issue44547.) I opened an issue for this proposal a few weeks back: https://bugs.python.org/issue44977 Mark On Thu, Oct 14, 2021 at 11:50 AM Serhiy Storchaka <storch...@gmail.com> wrote: > 14.10.21 12:24, Eryk Sun пише: > > Maybe an alternate constructor could be added -- such as > > int.from_number() -- which would be restricted to calling __int__(), > > __index__(), and __trunc__(). > > See thread "More alternate constructors for builtin type" on Python-ideas: > > https://mail.python.org/archives/list/python-id...@python.org/thread/5JKQMIC6EUVCD7IBWMRHY7DRTTNSBOWG/ > > _______________________________________________ > 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/NU3774YDVCIUH44C7RZXCSSVRVYSLCUI/ > Code of Conduct: http://python.org/psf/codeofconduct/ >
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