define matrices that vary both the python version and the dependency version

[axiomofjoy]

I am able to define matrices for testing on different Python versions. I am also able to define a matrix for testing using different dependency versions using the approach described in this issue. However, using both at once results in a large number of combinations that slows down my pipeline. How would I test on Python 3.8 with pydantic<2 and on Python 3.12 with pydantic>=2.0.0 with only two runs of my test suite?

[ofek]

please enumerate the exact environments you want with which dependencies

[axiomofjoy]

Thanks for the fast response. I would like to test on the following environments:

• Python 3.8 with pydantic v1
• Python 3.12 with pydantic v2

Here is my current configuration in pyproject.toml.

[tool.hatch.envs.test.overrides]
matrix.pydantic.dependencies = [
  { value = "pydantic<2", if = ["pydantic-v1"] },
  { value = "pydantic>=2.0.0", if = ["pydantic-v2"] },
]

[[tool.hatch.envs.test.matrix]]
python = ["3.8", "3.12"]
pydantic = ["pydantic-v1", "pydantic-v2"]

This results in four runs of the test suite. I would like to have just two.

[ofek]

the condition should be based on the Python version

[axiomofjoy]

Thanks, I should have thought of that.

For posterity, here's what worked for me.

[tool.hatch.envs.test.overrides]
matrix.python.dependencies = [
  { value = "pydantic<2", if = ["3.8"] },
  { value = "pydantic>=2.0.0", if = ["3.12"] },
]

[[tool.hatch.envs.test.matrix]]
python = ["3.8", "3.12"]