Guido van Rossum <gu...@python.org> added the comment:
FWIW here's a minimal demo:
from __future__ import annotations
from typing import get_type_hints
class C:
def func(self, a: "C"):
pass
print(get_type_hints(func))
In 3.8 this prints
{'a': ForwardRef('C')}
while in 3.9 it raises NameError:
Traceback (most recent call last):
File "C:\Users\gvanrossum\cpython\t.py", line 4, in <module>
class C:
File "C:\Users\gvanrossum\cpython\t.py", line 8, in C
print(get_type_hints(func))
File "C:\Python39\lib\typing.py", line 1386, in get_type_hints
value = _eval_type(value, globalns, localns)
File "C:\Python39\lib\typing.py", line 254, in _eval_type
return t._evaluate(globalns, localns, recursive_guard)
File "C:\Python39\lib\typing.py", line 497, in _evaluate
self.__forward_value__ = _eval_type(
File "C:\Python39\lib\typing.py", line 254, in _eval_type
return t._evaluate(globalns, localns, recursive_guard)
File "C:\Python39\lib\typing.py", line 493, in _evaluate
eval(self.__forward_code__, globalns, localns),
File "<string>", line 1, in <module>
NameError: name 'C' is not defined
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue41987>
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