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![]() ## Summary This allows us to fix usages like: ```python from pandas import DataFrame def baz() -> DataFrame: ... ``` By quoting the `DataFrame` in `-> DataFrame`. Without quotes, moving `from pandas import DataFrame` into an `if TYPE_CHECKING:` block will fail at runtime, since Python tries to evaluate the annotation to add it to the function's `__annotations__`. Unfortunately, this does require us to split our "annotation kind" flags into three categories, rather than two: - `typing-only`: The annotation is only evaluated at type-checking-time. - `runtime-evaluated`: Python will evaluate the annotation at runtime (like above) -- but we're willing to quote it. - `runtime-required`: Python will evaluate the annotation at runtime (like above), and some library (like Pydantic) needs it to be available at runtime, so we _can't_ quote it. This functionality is gated behind a setting (`flake8-type-checking.quote-annotations`). Closes https://github.com/astral-sh/ruff/issues/5559. |
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