[issue1785] "inspect" gets broken by some descriptors

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

The 'type' object now has the same issue: __abstractmethods__ appears in dir(type) but type.__abstractmethods__ fails with an AttributeError.
See issue13581

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nosy: +amaury.forgeotdarc

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<http://bugs.python.org/issue1785>
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