New submission from Lincoln Quirk <[email protected]>:
Consider this code:
```
from __future__ import annotations
import typing
class A:
f: 'Undef'
hints = typing.get_type_hints(A)
```
Since Undef is not defined, I should get an exception when calling
get_type_hints, something like "NameError: name 'Undef' is not defined". But
instead, get_type_hints returns {'f': ForwardRef('Undef')}.
If I remove the `from __future__ import annotations` line, get_type_hints
correctly raises this exception.
I think the behavior should be to raise an exception in both cases.
----------
messages: 334396
nosy: Lincoln Quirk
priority: normal
severity: normal
status: open
title: get_type_hints exposes an instance of ForwardRef (internal class) in its
result, with `from __future__ import annotations` enabled
type: behavior
versions: Python 3.7, Python 3.8
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Python tracker <[email protected]>
<https://bugs.python.org/issue35834>
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