[issue35834] get_type_hints exposes an instance of ForwardRef (internal class) in its result, with `from __future__ import annotations` enabled

[Steven D'Aprano]

Steven D'Aprano <steve+python at pearwood.info> added the comment:

Wait, I just noticed that PEP563 says:

"Note: if an annotation was a string literal already, it will still be wrapped in a string."

https://www.python.org/dev/peps/pep-0563/#id5

In 3.8.0a I get this:

py> from __future__ import annotations
py>
py> class A:
...     f: 'Undef'
...
py> A.__annotations__
{'f': "'Undef'"}

which matches what the PEP says. So I expect that when calling get_type_hints it should return the unquoted string, rather than a ForwardReference.

get_type_hints(A)

expected {'f': 'Undef'}
actually got {'f': ForwardRef('Undef')}

----------

_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35834>
_______________________________________