[Python-ideas] The AttributeError/__getattr__ mechanism

[王珺]

> A dedicated subclass of *Attr*ibuteError to trigger __get*attr*__ is more
natural.
I mean it's unnatural to convert AttributeError to AttributeDynamicError by
property or descriptor. Why not use RuntimeError as that of PEP479?

And there's no need to write custom property-like descriptor factory when
you want to trigger __getattr__, although it may be only a few lines of
code.
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