Feature or enhancement

Following 6d59c9e,typing._ProtocolMeta.__instancecheck__ usesinspect.getattr_static in a tight loop, where it had previously usedhasattr. This improves semantics in several highly desirable ways, but causes a considerable slowdown for_ProtocolMeta.__instancecheck__, asinspect.getattr_static ismuch slower thanhasattr.

The performance hit to_ProtocolMeta.__instancecheck__ has already been mostly mitigated through severaltyping-specific optimisations that are tracked in this issue:

• Performance of typing._ProtocolMeta._get_protocol_attrs and isinstance #74690

However, it would be good to also see if we can improve the performance ofinspect.getattr_static. This will not only improve the performance ofisinstance() checks against classes subclassingtyping.Protocol. It will also improve the performance of all other tools that useinspect.getattr_static for introspection without side effects.

Linked PRs

• gh-103193: Micro-optimise helper functions forinspect.getattr_static #103195
• gh-103193: Use LBYL idioms rather than EAFP ininspect.getattr_static #103318
• gh-103193: Speedup and inlineinspect._is_type #103321
• gh-103193: Celebrate performance improvements toinspect.getattr_static in 'What's New in Python 3.12' #103349
• gh-103193: cache calls toinspect._shadowed_dict ininspect.getattr_static #104267
• gh-103193: Improvegetattr_static test coverage #104286
• [3.11] gh-103193: Improvegetattr_static test coverage (GH-104286) #104290
• gh-103193: Fix refleaks intest_inspect andtest_typing #104320