No solution found when resolving dependencies for split (platform_python_implementation == 'PyPy')

[kdebrab]

Summary

The error 'No solution found when resolving dependencies for split (platform_python_implementation == 'PyPy')' is raised even though the marker platform_python_implementation != 'PyPy' is used.

Minimal Reproducible Example

Following resolution failure looks like a bug to me:

Running uv lock (or uv sync or even uv run python) with following pyproject.toml:

[project]
name = "pythonproject"
version = "0.1.0"
requires-python = "==3.12.*"
dependencies = ["urllib3==2.3.0"]
optional-dependencies.test = [
"vcrpy==7.0.0 ; platform_python_implementation != 'PyPy'",
]

yields:

  x No solution found when resolving dependencies for split (platform_python_implementation == 'PyPy'):
  `-> Because only the following versions of urllib3{platform_python_implementation == 'PyPy'} are available:
          urllib3{platform_python_implementation == 'PyPy'}==0.3
          urllib3{platform_python_implementation == 'PyPy'}==1.0
          urllib3{platform_python_implementation == 'PyPy'}==1.0.1
          [...]
          urllib3{platform_python_implementation == 'PyPy'}==1.26.20
          urllib3{platform_python_implementation == 'PyPy'}>2
      and urllib3{platform_python_implementation == 'PyPy'}>=1.25,<=1.25.1 was yanked (reason: Broken release), we can conclude that urllib3{platform_python_implementation ==      
      'PyPy'}>=1.25,<=1.25.1 depends on urllib3<=1.24.3.
      And because vcrpy==7.0.0 depends on urllib3{platform_python_implementation == 'PyPy'}<2 and pythonproject[test] depends on vcrpy{platform_python_implementation !=
      'PyPy'}==7.0.0, we can conclude that pythonproject[test] depends on one of:
          urllib3<=1.24.3
          urllib3>=1.25.2,<=1.26.20

      And because your project depends on urllib3==2.3.0 and your project requires pythonproject[test], we can conclude that your project's requirements are unsatisfiable.

Note that especially And because vcrpy==7.0.0 depends on urllib3{platform_python_implementation == 'PyPy'}<2 and pythonproject[test] depends on vcrpy{platform_python_implementation != 'PyPy'}==7.0.0 seems a conflicting statement.

Platform

Windows 11

Version

uv 0.5.26 (5ef3d51 2025-01-30)

Python version

Python 3.12.8

[charliermarsh]

Try adding:

[tool.uv]
environments = ["platform_python_implementation != 'PyPy'"]