improve reduce_by_python_constraint

[radoering]

Related to: python-poetry/poetry#10195

• Added tests for changed code.
• Updated documentation for changed code.

Summary by Sourcery

This pull request enhances the reduce_by_python_constraint function to improve its accuracy when dealing with Python version constraints. It also adds new test cases to ensure the correctness of the changes.

Enhancements:

• Improves the reduce_by_python_constraint function to better handle version constraints, especially when intersecting with python_version markers.

Tests:

• Adds new test cases to cover the improved logic for reducing markers based on Python version constraints.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request enhances the reduce_by_python_constraint method in poetry.core.version.markers.py to improve its ability to reduce markers based on Python version constraints. The changes include handling cases where the marker's constraint is fully outside the Python constraint, and implementing intersection logic to refine the marker. Additionally, new test cases have been added to ensure the correctness of the updated logic.

Sequence diagram for reduce_by_python_constraint method

sequenceDiagram
  participant Marker as M
  participant VersionConstraint as VC
  M->>M: reduce_by_python_constraint(python_constraint: VC)
  alt self.name in PYTHON_VERSION_MARKERS
    M->>M: get_python_constraint_from_marker()
    M->>VC: allows_any(python_constraint)
    alt not constraint.allows_any(python_constraint)
      M-->>M: return EmptyMarker()
    else constraint.allows_any(python_constraint)
      M->>M: create_nested_marker("python_version", python_constraint)
      M->>M: parse_marker()
      M->>M: intersect(python_marker)
      alt isinstance(intersection, SingleMarker)
        M-->>M: return intersection
      end
    end
  end
  M-->>M: return self

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File-Level Changes

Change	Details	Files
Improved the reduce_by_python_constraint method to better handle version constraints and intersections with Python version markers.	Added logic to handle cases where the marker's constraint is fully outside the Python constraint, resulting in an EmptyMarker. Implemented intersection logic to refine the marker based on the Python constraint, returning a SingleMarker when appropriate. Added a test case for when the marker's constraint is fully outside the Python constraint. Added test cases for when the marker's constraint is equal to or less than the Python constraint. Modified test cases to reflect the new logic.	tests/version/test_markers.py src/poetry/core/version/markers.py

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[sourcery-ai]

Hey @radoering - I've reviewed your changes - here's some feedback:

Overall Comments:

• It looks like you're importing create_nested_marker twice - you only need to import it once.
• Consider adding a comment explaining the logic behind intersecting with python_marker.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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