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A while ago we introduced the concept of "soft deprecation" in PEP 387 (https://peps.python.org/pep-0387/#soft-deprecation): for things that we no longer recommend using, but which we aren't planning to remove in the near future.
The typing docs already list four classes of objects that are deprecated without a scheduled removal (https://docs.python.org/3.14/library/typing.html#deprecation-timeline-of-major-features):
- Pre-PEP-585 generic aliases (e.g.
List
) Text
Hashable
andSized
TypeAlias
I'd like to also soft-deprecate the following:
Optional
(obviated by PEP-604)NoReturn
(preferNever
)typing.ForwardRef
(deprecated alias forannotationlib.ForwardRef
)types.UnionType
(deprecated alias fortyping.Union
)- Creating a
Union
using subscripting (Union[A, B]
instead ofA | B
) (PEP-604) - Creating a
TypeVar
,ParamSpec
, orTypeVarTuple
using the constructor directly (PEP-695) - Directly inheriting from
Generic
(PEP-695)
None of those will be removable for many years if ever, but I think it's useful to have a clear statement in the docs that the newer syntax is preferred.
srittau and Avasam
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