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Title: Skip __class__ lookup in object_isinstance for standard getattro by youknowone · Pull Request #7303 · RustPython/RustPython · GitHub

Open Graph Title: Skip __class__ lookup in object_isinstance for standard getattro by youknowone · Pull Request #7303 · RustPython/RustPython

X Title: Skip __class__ lookup in object_isinstance for standard getattro by youknowone · Pull Request #7303 · RustPython/RustPython

Description: In object_isinstance(), when is_subtype() returns false, the class attribute lookup via get_attribute_opt is redundant for objects using standard getattribute, since class is a data descriptor on object that always returns obj.class(). Summary by CodeRabbit Performance Improvements Optimized isinstance checks by streamlining attribute lookup paths for standard attribute access scenarios.

Open Graph Description: In object_isinstance(), when is_subtype() returns false, the class attribute lookup via get_attribute_opt is redundant for objects using standard getattribute, since class is a data descriptor on o...

X Description: In object_isinstance(), when is_subtype() returns false, the class attribute lookup via get_attribute_opt is redundant for objects using standard getattribute, since class is a data descriptor on o...

Opengraph URL: https://github.com/RustPython/RustPython/pull/7303

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3b49a33 Skip __class__ lookup in object_isinstance for standard getattro youknowone Mar 1, 2026 https://github.com/RustPython/RustPython/pull/7303/commits/3b49a3350531bef2c06cccab4d1486b51d5125b9
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