python · miss-islington · Apr 10, 2023 · Apr 10, 2023
@@ -2099,6 +2099,8 @@ 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):
@@ -2151,6 +2153,10 @@ 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]