Resolver: tighter requires-python bound in consumer fails to satisfy

I have two projects, both of which I control -- so this is not a blocker for me, but I think it's doing the wrong thing.

I have a consuming project, seattle-2025, that has requires-python = "~=3.12.3" and a dependency project, nomnom-hugoawards that has requires-python = "~=3.12.4"

On the surface, these seem to be satisfiable when resolving dependencies for seattle-2025; there are plenty of Python versions in the range, including 3.12.4.

However, when I attempt to sync, here's what I get:

$ uv sync
  × No solution found when resolving dependencies:
  ╰─▶ Because the requested Python version (>=3.12.3, <3.13) does not satisfy Python>=3.12.4,<3.13
      and nomnom-hugoawards==2025.0.0b5.dev1 depends on Python>=3.12.4,<3.13, we can conclude that
      nomnom-hugoawards==2025.0.0b5.dev1 cannot be used.
      And because only nomnom-hugoawards==2025.0.0b5.dev1 is available and your project depends on
      nomnom-hugoawards, we can conclude that your project's requirements are unsatisfiable.

      hint: The `requires-python` value (>=3.12.3, <3.13) includes Python versions that are not
      supported by your dependencies (e.g., nomnom-hugoawards==2025.0.0b5.dev1 only supports >=3.12.4,
      <3.13). Consider using a more restrictive `requires-python` value (like >=3.12.4, <3.13).
$ uv --version
uv 0.4.27 (36b729e92 2024-10-25)

Maybe I'm missing something, but I would expect dependency resolving to find the intersection of the required python versions, rather than require the consumer to be a superset. I wasn't able to infer this behavior from the resolver docs.

In this case, I'd expect 3.12.4 to satisfy the resolver.

Your project needs to be a subset, since right now, your project says it supports Python 3.12.3, but you have a dependency that doesn't support that version. We're not looking for a single version that works; we're looking to create a resolution that works for all the stated Python versions.

Oh... okay, that is very much not how I interpreted those bounds.

Fair enough, and I'll make the changes on my end -- the nice part about controlling both sides of this!. I suppose on some level this is a documentation bug report, then. Thanks!

Clarify `requires-python` requirement for dependencies (astral-sh#8619)

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Resolver: tighter requires-python bound in consumer fails to satisfy #8597

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Resolver: tighter requires-python bound in consumer fails to satisfy #8597

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charliermarsh commented on Oct 26, 2024

offbyone commented on Oct 26, 2024

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