stackoverflow May 16, 2026 Rep: 65

"name 'T' is not defined" when evaluating annotations on inherited methods using Python 3.12+ type parameter syntax

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May 16, 2026 Score: 5 Rep: 124,188 Quality: High Completeness: 70%

It's a known bug; as Alex Waygood explains in python/cpython#114053:

I suppose the problem is probably that gettypehints looks things up in the global scope but doesn't look things up in the new annotation scopes introduced by PEP-695. The old way of defining TypeVars doesn't suffer from this because TypeVars were defined in the global scope; now they aren't.

It was fixed in version 3.12.5.

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