Use of `__future__` prevents use in python 3.13 and later

[sarahec]

While building for NixOS/nixpkgs, compilation fails on python 3.13 with error: future-1.0.0 not supported for interpreter python3.13

The future package is a python 2-to-3 compatibility layer and has been fully absorbed into Python. What's new in python 3.13 states:

Future statements are no longer triggered by relative imports of the future module, meaning that statements of the form from .future import ... are now simply standard relative imports, with no special features activated. (Contributed by Jeremiah Gabriel Pascual in gh-118216.)

In this case, you're using from __future__ import annotations in three places. In all of these cases, you can use inspect.get_annotations() to read the annotations, see https://docs.python.org/3/howto/annotations.html#annotations-best-practices

[baberabb]

looks like its fixed? NixOS/nixpkgs#417098

future really shouldn't bring in any breaking changes.

[sarahec]

looks like its fixed? NixOS/nixpkgs#417098

future really shouldn't bring in any breaking changes.

From the bug:

I was able to fix this for my personal use-case

Sadly, not a help when packaging.

P.S. It's not clear the import of annotations from __future__ does anything in this code.