Drop Python3.9 support

[hramezani]

Selected Reviewer: @samuelcolvin

[hramezani]

@kschwab we are going to drop python3.9 support.

There is two tests in test_source_cli.py that need to be changed.

• test_cli_metavar_format
• test_cli_metavar_format_310

Could you please review and correct them? You can find the format errors in lint CI.
Please create a PR or simply paste your diff as a comment in my PR and I will apply them to my PR

[tschm]

you can fix with 'uvx ruff check .'

[hramezani]

you can fix with 'uvx ruff check .'

Some logic on those two tests that I mentioned above is related to Python < 3.9. It is not only about fixing some lint error.

We have a make format command in the repo that fixes all lint errors.

pydantic-settings/Makefile

Line 15 in 4433101

uv run ruff check --fix $(sources)

[kschwab]

@hramezani, is the goal to remove Union from import? I can remove references, it just will extend the lists. e.g.:

@pytest.mark.parametrize(
    'value_gen,expected',
    [
        (lambda: str | int, '{str,int}'),
        (lambda: list[int], 'list[int]'),
        (lambda: List[int], 'List[int]'),  # noqa: UP006
        (lambda: list[dict[str, int]], 'list[dict[str,int]]'),
        (lambda: list[str | int], 'list[{str,int}]'),
        (lambda: list[str | int], 'list[{str,int}]'),
        (lambda: LoggedVar[int], 'LoggedVar[int]'),
        (lambda: LoggedVar[Dict[int, str]], 'LoggedVar[Dict[int,str]]'),  # noqa: UP006

        # Duplicate list above but with None
        (lambda: str | int | None, '{str,int}'),
        (lambda: list[int] | None, 'list[int]'),
        (lambda: List[int] | None, 'List[int]'),  # noqa: UP006
        (lambda: list[dict[str, int]] | None, 'list[dict[str,int]]'),
        (lambda: list[str | int] | None, 'list[{str,int}]'),
        (lambda: list[str | int] | None, 'list[{str,int}]'),
        (lambda: LoggedVar[int] | None, 'LoggedVar[int]'),
        (lambda: LoggedVar[Dict[int, str]] | None, 'LoggedVar[Dict[int,str]]'),  # noqa: UP006
    ],
)

Currently it is used for dynamic Union creation in the test cases. Thoughts?

[hramezani]

@hramezani, is the goal to remove Union from import? I can remove references, it just will extend the lists. e.g.:

@pytest.mark.parametrize(
    'value_gen,expected',
    [
        (lambda: str | int, '{str,int}'),
        (lambda: list[int], 'list[int]'),
        (lambda: List[int], 'List[int]'),  # noqa: UP006
        (lambda: list[dict[str, int]], 'list[dict[str,int]]'),
        (lambda: list[str | int], 'list[{str,int}]'),
        (lambda: list[str | int], 'list[{str,int}]'),
        (lambda: LoggedVar[int], 'LoggedVar[int]'),
        (lambda: LoggedVar[Dict[int, str]], 'LoggedVar[Dict[int,str]]'),  # noqa: UP006

        # Duplicate list above but with None
        (lambda: str | int | None, '{str,int}'),
        (lambda: list[int] | None, 'list[int]'),
        (lambda: List[int] | None, 'List[int]'),  # noqa: UP006
        (lambda: list[dict[str, int]] | None, 'list[dict[str,int]]'),
        (lambda: list[str | int] | None, 'list[{str,int}]'),
        (lambda: list[str | int] | None, 'list[{str,int}]'),
        (lambda: LoggedVar[int] | None, 'LoggedVar[int]'),
        (lambda: LoggedVar[Dict[int, str]] | None, 'LoggedVar[Dict[int,str]]'),  # noqa: UP006
    ],
)

Currently it is used for dynamic Union creation in the test cases. Thoughts?

@kschwab Yes, the goal is to remove Union and Python3.9 related code and tests. we have some Union in the above two tests function body. that's why I mentioned them. I think we need to change those function test body.