Be more explicit about inability to resolve workspace requires-python #10835
Description
Summary
When attempting to resolve dependencies in a workspace where the requires-python is set with a lower bound in the root and in each project, but the versions are incompatible, something like the following is printed:
warning: The workspace `requires-python` value (``) does not contain a lower bound. Add a lower bound to indicate the minimum compatible Python version (e.g., `>=3.12`).
⠼ Resolving dependencies...
× No solution found when resolving dependencies:
╰─▶ Because the requested Python version () does not satisfy Python>=3.12 and your workspace requires some-package:dev, we can conclude that your workspace's requirements are unsatisfiable.
This is misleading because the workspace requires-python is non-empty and does include a lower bound. Perhaps more appropriate behavior would be to error earlier on an empty resolved requires-python?
Note the example structure instead prints:
warning: The workspace `requires-python` value (``) does not contain a lower bound. Add a lower bound to indicate the minimum compatible Python version (e.g., `>=3.12`).
× No solution found when resolving dependencies:
╰─▶ Because the requested Python version () does not satisfy Python>=3.10 and albatross depends on Python>=3.10, we can conclude that albatross's requirements are unsatisfiable.
And because your workspace requires albatross, we can conclude that your workspace's requirements are unsatisfiable.
hint: The `requires-python` value () includes Python versions that are not supported by your dependencies (e.g., albatross==0.1.0 only supports >=3.10). Consider using a more restrictive `requires-python` value (like >=3.10).
I'm not easily able to reproduce the exact behavior in the first example.
Example
Using the repo structure from the docs:
albatross
├── packages
│ ├── bird-feeder
│ │ ├── pyproject.toml
│ └── seeds
│ ├── pyproject.toml
├── pyproject.toml
pyproject.toml:
[project]
name = "albatross"
version = "0.1.0"
requires-python = ">=3.10"
[tool.uv.workspace]
members = ["packages/*"]
packages/bird-feeder/pyproject.toml:
[project]
name = "bird-feeder"
version = "0.1.0"
requires-python = "==3.10"
packages/seeds/pyproject.toml:
[project]
name = "seeds"
version = "0.1.0"
requires-python = ">=3.12"