AttributeError 'did you mean' suggestions don't appear for properties without a setter

Bug report

Bug description:

class A:
    @property
    def computed_a(self):
        return 2

    @property
    def computed_b(self):
        return 3
    @computed_b.setter
    def computed_b(self, val):
        print('set!')

a = A()
a.computed_a = 12 # typo

When running this, I would expect to get AttributeError: ... Did you mean: 'computed_b', but I'm not getting a suggestion. I think it's because the AttributeError that property.__set__ raises doesn't have .obj and .name set.

CPython versions tested on:

CPython main branch

Operating systems tested on:

Linux

CPython の main ブランチで報告されたプロパティ代入の例を再現し、property.set の実装と AttributeError の候補提示処理を調査します。読み取り専用の計算プロパティ computed_a に代入したときに、関連する “Did you mean” の候補を含む AttributeError が生成され、setter のケースが変更されていなければ、修正は完了です。