diff --git a/Lib/typing.py b/Lib/typing.py index 1f1c4ffa2566ab..7c165562c2b53d 100644 --- a/Lib/typing.py +++ b/Lib/typing.py @@ -2154,6 +2154,8 @@ class _AnnotatedAlias(_NotIterable, _GenericAlias, _root=True): with extra annotations. The alias behaves like a normal typing alias, instantiating is the same as instantiating the underlying type, binding it to types is also the same. + + The metadata itself is stored in a '__metadata__' attribute as a tuple. """ def __init__(self, origin, metadata): if isinstance(origin, _AnnotatedAlias): @@ -2209,6 +2211,10 @@ class Annotated: Details: - It's an error to call `Annotated` with less than two arguments. + - Access the metadata via the ``__metadata__`` attribute:: + + Annotated[int, '$'].__metadata__ == ('$',) + - Nested Annotated are flattened:: Annotated[Annotated[T, Ann1, Ann2], Ann3] == Annotated[T, Ann1, Ann2, Ann3]