Python requirement of package completely ignored by poetry

[onnoeberhard]

• I am on the latest Poetry version.
• I have searched the issues of this repo and believe that this is not a duplicate.
• If an exception occurs when executing a command, I executed it again in debug mode (-vvv option).

• OS version and name: macOS 12.3.1
• Poetry version: 1.1.13
• Link of a Gist with the contents of your pyproject.toml file: (contents pasted below)

Issue

I created a completely empty folder with the following pyproject.toml file:

[tool.poetry]
name = "abcd"
version = "0.1.0"
description = ""
authors = ["Onno Eberhard <onnoeberhard@gmail.com>"]

[tool.poetry.dependencies]
python = "^3.9"

[tool.poetry.dev-dependencies]
dm-control = {version = "^1.0.2", python = ">=3.9,<=3.10"}

[build-system]
requires = ["poetry-core>=1.0.0"]
build-backend = "poetry.core.masonry.api"

Running poetry update yields the following error message:

Updating dependencies
Resolving dependencies... (0.0s)

  SolverProblemError

  The current project's Python requirement (>=3.9,<4.0) is not compatible with some of the required packages Python requirement:
    - dm-control requires Python >=3.7, <=3.10, so it will not be satisfied for Python >3.10,<4.0

  Because no versions of dm-control match >1.0.2,<2.0.0
   and dm-control (1.0.2) requires Python >=3.7, <=3.10, dm-control is forbidden.
  So, because abcd depends on dm-control (^1.0.2), version solving failed.

  at ~/.poetry/lib/poetry/puzzle/solver.py:241 in _solve
      237│             packages = result.packages
      238│         except OverrideNeeded as e:
      239│             return self.solve_in_compatibility_mode(e.overrides, use_latest=use_latest)
      240│         except SolveFailure as e:
    → 241│             raise SolverProblemError(e)
      242│
      243│         results = dict(
      244│             depth_first_search(
      245│                 PackageNode(self._package, packages), aggregate_package_nodes

  • Check your dependencies Python requirement: The Python requirement can be specified via the `python` or `markers` properties

    For dm-control, a possible solution would be to set the `python` property to ">=3.9,<=3.10"

    https://python-poetry.org/docs/dependency-specification/#python-restricted-dependencies,
    https://python-poetry.org/docs/dependency-specification/#using-environment-markers

The suggestion is to "set the python property to ">=3.9,<=3.10"", which I have done. I can only conclude that poetry completely ignores this property.

[abn]

Workaround:

dm-control = {version = "^1.0.2", python = ~3.9,<=3.10"}

[dimbleby]

the suggestion is trying to tell you that you could set the project-level python property, it is not intending to be about any property on this particular package.

[onnoeberhard]

@abn Thanks! The workaround does indeed work for this example, but in my actual project I am using Python 3.8, so "~3.8" would mean something different than ">=3.8,<=3.10". I still tried it but then I got the same error message (again for dm-control, but with the python property set to "~3.8") when I tried to add another dependency (flake8)...

@dimbleby Thanks, but as I am only using this package as a development dependency I don't want to change the Python version of the whole project.

[dimbleby]

@onnoeberhard I wasn't telling you to make that change, I was telling you what the error message was saying. ie

The suggestion is to "set the python property to ">=3.9,<=3.10"", which I have done.

is a misunderstanding of what the suggestion was.

Having said which, I'm not completely sure that I was right about that!

[github-actions]

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