Cross-area library

Content Library

A single library for content items across the complete Content Area hierarchy. Content Areas and Categories define the structure;

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Python typing.Annotated: Attach Type Metadata

Annotated[ValueType, metadata] attaches optional information to a type.

4 views Oct 17, 2026

Python typing.Any vs object vs Never

Any disables many static checks for a value, object allows any value but requires narrowing before type-specific operations, and Never describes an impossible value or a function that canno…

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Python typing.assert_never() Function: Exhaustive Checking

assert_never(value) reports an impossible type to a static checker and raises an AssertionError if executed.

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Python typing.assert_type() Function: Type Checker Verification

assert_type(expression, expected_type) tells static type checkers which inferred type you expect.

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Python typing.cast() Function: Usage and Examples

typing.

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Python typing.ClassVar: Declare Class Variables

ClassVar identifies attributes belonging to the class rather than individual dataclass fields or instance-specific values.

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Python typing.Concatenate: Transform Callable Parameters

Concatenate adds fixed leading parameters to a ParamSpec-based callable.

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Python typing.dataclass_transform: Support Data-Like Classes

dataclass_transform signals to static type checkers that a decorator, metaclass or base class creates dataclass-like behavior.

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Python typing.Final: Mark Constants and Attributes

Final indicates that a variable or class attribute should not be reassigned, or a method overridden, under static type checking rules.

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