Summary

In the napari project, we are using tox with tox-uv and tox-min-req plugins. The second one is my project.

This plugin is reading pyproject.toml and generating a constraints file with pinning versions of direct constraints to the lowest defined.

So for numpy>=1.24.2 it will add to the constraints file, the numpy==1.24.2 entry, and for "pywin32 ; platform_system == 'Windows'" will not add entry.

In the PR napari/napari#8646 the team member bumped the version of one of our dependencies (superqt). But at this state our dependencies contain qtpy>=2.3.1 and superqt one contains qtpy>=2.4.0. So generate a constraints file containing qtpy==2.3.1 that creates an environment impossible to resolve.

However, the error message, instead of mentioning the constraints file, points to the napari-plugin-manager as the source of conflict.

Using Python 3.10.19 environment at: .tox/py310-linux-pyqt5-cov
  × No solution found when resolving dependencies:
  ╰─▶ Because superqt==0.7.8 depends on qtpy>=2.4.0 and
      napari-plugin-manager==0.1.10 depends on superqt==0.7.8, we can conclude
      that napari-plugin-manager==0.1.10 depends on qtpy>=2.4.0.
      And because napari-plugin-manager==0.1.10 depends on qtpy==2.3.1, we can
      conclude that napari-plugin-manager==0.1.10 cannot be used.
      And because only napari-plugin-manager<=0.1.10 is available and you
      require napari-plugin-manager>=0.1.10, we can conclude that your
      requirements are unsatisfiable.

The napari-plugin-manager do not provide any constraints on qtpy version:

https://github.com/napari/napari-plugin-manager/blob/cad2c38d06d6a282c5601e4d557735b37a2b13c7/pyproject.toml#L55

It will be really nice to point out that problematic constraints are coming from the constraints file (provided by the UV_CONSTRAINTS environment variable), not put a random package in its place.

Full log of CI run: https://github.com/napari/napari/actions/runs/21787550870/job/62864041807?pr=8646

napari pinning of qtpy: https://github.com/napari/napari/blob/b9011a81f9d1df1d96fc81b252203b542075570c/pyproject.toml#L67

superqt pinning of qtpy: https://github.com/pyapp-kit/superqt/blob/872dff13eb03818d92dd610dbda28bb631600a9c/pyproject.toml#L49

Platform

GHA ubuntu-22.04

Version

0.10.2

Python version

3.10