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Opening for visibility. Issue on bugs.python.org: https://bugs.python.org/issue45166.
Feel free to close here or there 😄
Originally reported and investigated here: mkdocstrings/mkdocstrings#314
# final.py
from __future__ import annotations
from typing import Final, get_type_hints
name: Final[str] = "final"
class Class:
value: Final = 3000
get_type_hints(Class)Run python final.py, and you'll get this traceback:
Traceback (most recent call last):
File "final.py", line 11, in <module>
get_type_hints(Class)
File "/.../lib/python3.8/typing.py", line 1232, in get_type_hints
value = _eval_type(value, base_globals, localns)
File "/.../lib/python3.8/typing.py", line 270, in _eval_type
return t._evaluate(globalns, localns)
File "/.../lib/python3.8/typing.py", line 517, in _evaluate
self.__forward_value__ = _type_check(
File "/.../lib/python3.8/typing.py", line 145, in _type_check
raise TypeError(f"Plain {arg} is not valid as type argument")
TypeError: Plain typing.Final is not valid as type argumentNow comment the get_type_hints call, launch a Python interpreter, and enter these commands:
>>> import final
>>> from typing import get_type_hints
>>> get_type_hints(final)And you'll get this traceback:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/.../lib/python3.9/typing.py", line 1449, in get_type_hints
value = _eval_type(value, globalns, localns)
File "/.../lib/python3.9/typing.py", line 283, in _eval_type
return t._evaluate(globalns, localns, recursive_guard)
File "/.../lib/python3.9/typing.py", line 538, in _evaluate
type_ =_type_check(
File "/.../lib/python3.9/typing.py", line 149, in _type_check
raise TypeError(f"{arg} is not valid as type argument")
TypeError: typing.Final[str] is not valid as type argumentI was able to replicate in 3.8, 3.9, 3.10 and 3.11. The annotations future is not available in 3.7 or lower.
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