René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"get_type_hints() fails on TypedDict inheriting from a generic TypedDict under PEP 563","articleBody":"# Bug report\n\n### Bug description:\n\nThis fails:\n\n```python\nfrom __future__ import annotations\nimport typing\nclass TD1[T](typing.TypedDict):\n    a: T\n\nclass TD2(TD1):\n    pass\n\nprint(typing.get_type_hints(TD2))\n```\n\n```\n$ uv run --python=3.13 sample3.py \nTraceback (most recent call last):\n  File \"/Users/jelle/py/cpython/sample3.py\", line 9, in \u003cmodule\u003e\n    print(typing.get_type_hints(TD2))\n          ~~~~~~~~~~~~~~~~~~~~~^^^^^\n  File \"/opt/homebrew/Cellar/python@3.13/3.13.7/Frameworks/Python.framework/Versions/3.13/lib/python3.13/typing.py\", line 2461, in get_type_hints\n    value = _eval_type(value, base_globals, base_locals, base.__type_params__)\n  File \"/opt/homebrew/Cellar/python@3.13/3.13.7/Frameworks/Python.framework/Versions/3.13/lib/python3.13/typing.py\", line 474, in _eval_type\n    return t._evaluate(globalns, localns, type_params, recursive_guard=recursive_guard)\n           ~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File \"/opt/homebrew/Cellar/python@3.13/3.13.7/Frameworks/Python.framework/Versions/3.13/lib/python3.13/typing.py\", line 1081, in _evaluate\n    eval(self.__forward_code__, globalns, localns),\n    ~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File \"\u003cstring\u003e\", line 1, in \u003cmodule\u003e\nNameError: name 'T' is not defined\n```\n\nAlso reproduces on 3.12 and on the latest RC of 3.14.\n\n(Got here while investigating https://github.com/python/cpython/issues/137226#issuecomment-3275500742, but since this variant is a longstanding bug we don't need to fix it for 3.14.0. I want to record and eventually fix it though.)\n\n### CPython versions tested on:\n\nCPython main branch, 3.15, 3.14, 3.13, 3.12\n\n### Operating systems tested on:\n\nmacOS","author":{"url":"https://github.com/JelleZijlstra","@type":"Person","name":"JelleZijlstra"},"datePublished":"2025-09-15T18:39:17.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/138949/cpython/issues/138949"}