uv sync failure

[radoshi]

gymnasium fails because of box2d issues.

$> uv sync
Resolved 257 packages in 1.01s
      Built slm-lab @ file:///Users/rushabh/slm-lab                                                                              × Failed to build `box2d-py==2.3.5`
  ├─▶ The build backend returned an error
  ╰─▶ Call to `setuptools.build_meta:__legacy__.build_wheel` failed (exit status: 1)

      [stdout]
      Using setuptools (version 82.0.1).
      running bdist_wheel
      running build
      running build_py
      copying library/Box2D/Box2D.py -> build/lib.macosx-11.0-arm64-cpython-312/Box2D
      copying library/Box2D/__init__.py -> build/lib.macosx-11.0-arm64-cpython-312/Box2D
      copying library/Box2D/b2/__init__.py -> build/lib.macosx-11.0-arm64-cpython-312/Box2D/b2
      running build_ext
      building 'Box2D._Box2D' extension
      swigging Box2D/Box2D.i to Box2D/Box2D_wrap.cpp
      swig -python -c++ -IBox2D -small -O -includeall -ignoremissing -w201 -globals b2Globals -outdir library/Box2D -keyword
      -w511 -D_SWIG_KWARGS -o Box2D/Box2D_wrap.cpp Box2D/Box2D.i

      [stderr]
      /Users/rushabh/.cache/uv/builds-v0/.tmpccG9a5/lib/python3.12/site-packages/setuptools/_distutils/dist.py:287:
      UserWarning: Unknown distribution option: 'test_suite'
        warnings.warn(msg)
      /Users/rushabh/.cache/uv/builds-v0/.tmpccG9a5/lib/python3.12/site-packages/setuptools/dist.py:765:
      SetuptoolsDeprecationWarning: License classifiers are deprecated.
      !!

              ********************************************************************************
              Please consider removing the following classifiers in favor of a SPDX license expression:

              License :: OSI Approved :: zlib/libpng License

              See https://packaging.python.org/en/latest/guides/writing-pyproject-toml/#license for details.
              ********************************************************************************

      !!
        self._finalize_license_expression()
      error: command 'swig' failed: No such file or directory


hint: `box2d-py` (v2.3.5) was included because `slm-lab:ml` (v5.3.0) depends on `gymnasium[box2d]` (v1.2.0) which depends on `box2d-py`
hint: Build failures usually indicate a problem with the package or the build environment%

PR with fix: #536

[kengz]

Fixed in master via #536 (merged, squash 474c734).

Root cause: gymnasium[box2d]==1.2.0 pulled box2d-py==2.3.5, whose source build fails (the swig ... No such file or directory / legacy setuptools break you hit). Bumping to gymnasium==1.3.0 resolves box2d-py==2.3.10, which builds cleanly.

Verified locally on a clean checkout:

• uv sync resolves and builds — box2d-py==2.3.10 + gymnasium==1.3.0.
• Full suite green: uv run pytest → 320 passed, 13 skipped.
• CI on the PR (test, ruff, docker) all green.

Pull latest master and re-run uv sync — you should be unblocked. Thanks for the clear repro and the fix PR! 🙏