attrs
Domain: Validation Typing
🎯 Motivation
attrs is a third-party library that inspired Python’s dataclass but offers more features like validation and converters. It is popular when you need runtime checks that dataclass does not provide out of the box.
📋 Concrete Example
@define class User: name: str = field(validator=lambda v: len(v) > 0) rejects empty names at runtime, a feature plain dataclass lacks without manual __post_init__.
🔗 Analogy
If dataclass is a basic bicycle, attrs is a geared mountain bike. Both get you there, but attrs has extra controls for rougher terrain (validation).