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typing.get_type_hints fails when passed a class with PEP 695 type parameters and PEP 563 is enabled #114053

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AlexWaygood
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3.12only security fixes3.13bugs and security fixesstdlibStandard Library Python modules in the Lib/ directorytopic-typingtype-bugAn unexpected behavior, bug, or error
@mjog

Description

@mjog

Bug report

Bug description:

from __future__importannotationsimporttypingclassTest[M]:attr:Mprint(typing.get_type_hints(Test))

This fails with a NameError:

$ poetry run python3 pep_695_get_type_hints.pyTraceback (most recent call last):  File "/home/mjog/pep_695_get_type_hints.py", line 8, in <module>    print(typing.get_type_hints(Test))          ^^^^^^^^^^^^^^^^^^^^^^^^^^^  File "/usr/lib/python3.12/typing.py", line 2197, in get_type_hints    value = _eval_type(value, base_globals, base_locals)            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  File "/usr/lib/python3.12/typing.py", line 393, in _eval_type    return t._evaluate(globalns, localns, recursive_guard)           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  File "/usr/lib/python3.12/typing.py", line 900, in _evaluate    eval(self.__forward_code__, globalns, localns),    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  File "<string>", line 1, in <module>NameError: name 'M' is not defined

Althoughget_type_hints does not work with imported imported type aliases, this is not imported, so I would expect it to work. Further, the documentation for the function indicates using PEP 563 should /help/, but in this case it actually causes an error.

FWIW, removing the PEP 563 import works fine, giving:

{'attr': M}

Python version:

$ poetry run python3 --versionPython 3.12.0

CPython versions tested on:

3.12

Operating systems tested on:

Linux

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3.12only security fixes3.13bugs and security fixesstdlibStandard Library Python modules in the Lib/ directorytopic-typingtype-bugAn unexpected behavior, bug, or error

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