Description
Bug report
Bug description:
I have many dataclasses created on demand by dataclasses.make_dataclass. 3.14 changes behaviour for instances of the dataclass.
In 3.13 and before, the instances have a __annotations__ attribute with the expected contents.
In 3.14, that attribute no longer exists, but calling instance.__annotate_func__ does return what was in __annotations__ before.
The 3.14 howto does say "you may access the annotations data member manually"
import dataclasses
import inspect
dc = dataclasses.make_dataclass("foo", (("one", int), ("two", str), ("three", complex)))
value = dc(1, 'hello', 3+4j)
print(f"{dir(value)=}")
try:
print(inspect.get_annotations(value))
except Exception as exc:
print("inspect.get_annotations exception: ", type(exc), exc)
if hasattr(dc, "__annotate_func__"):
print(f"{value.__annotate_func__()=}")For Python 3.13:
dir(value)=['__annotations__', '__class__', '__dataclass_fields__', '__dataclass_params__ ....
For Python 3.14:
dir(value)=['__annotate_func__', '__annotations_cache__', '__class__', '__dataclass_fields__' ....
In both cases inspect.get_annotations() does give TypeError.
The release notes cover annotations, but nothing about changes to dataclasses instances.
Perhaps the annotations attributes shouldn't be on instances, but they have been. I also see __annotate_func__ on instances of regular objects from Python classes.
CPython versions tested on:
3.14, 3.13
Operating systems tested on:
Linux