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feat: Add assert_err and assert_warn #20100

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This PR adds the assert_eq and assert_warn methods on LazyFrame and DataFrame. These methods take a set of (possibly named) properties and verify during execution that these properties hold for all values. If a property does not hold, it will throw an error or a warning, respectively.

These methods are currently unstable, but I think they can be marked as stable relatively quickly.

@coastalwhite coastalwhite changed the title feat: Add assert_err and assert_warn. feat: Add assert_err and assert_warn Dec 2, 2024
@github-actions github-actions bot added enhancement New feature or an improvement of an existing feature python Related to Python Polars rust Related to Rust Polars and removed title needs formatting labels Dec 2, 2024
This PR adds the `assert_eq` and `assert_warn` methods on `LazyFrame` and
`DataFrame`. These methods take a set of (possibly named) properties and verify
during execution that these properties hold for all values. If a property does
not hold, it will throw an error or a warning, respectively.

These methods are currently unstable, but I think they can be marked as stable
relatively quickly.
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enhancement New feature or an improvement of an existing feature python Related to Python Polars rust Related to Rust Polars
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