Function _get_dunder_annotations

Lib/annotationlib.py:1144–1165

Return the annotations for an object, checking that it is a dictionary. Does not return a fresh dictionary.

(obj)

def _get_dunder_annotations(obj):
    """Return the annotations for an object, checking that it is a dictionary.

    Does not return a fresh dictionary.
    """
    # This special case is needed to support types defined under
    # from __future__ import annotations, where accessing the __annotations__
    # attribute directly might return annotations for the wrong class.
    if isinstance(obj, type):
        try:
            ann = _BASE_GET_ANNOTATIONS(obj)
        except AttributeError:
            # For static types, the descriptor raises AttributeError.
            return None
    else:
        ann = getattr(obj, "__annotations__", None)
        if ann is None:
            return None

    if not isinstance(ann, dict):
        raise ValueError(f"{obj!r}.__annotations__ is neither a dict nor None")
    return ann