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Allows field transformer callables to be generator functions that yield attribute objects.
Distinct from Field Transformations: Distinct from Field Transformations: focuses on supporting generator functions as field transformers, not general field value transformations.
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attrs is a Python library that automatically generates initialization, representation, equality, hashing, and ordering methods from declarative class attribute definitions. At its core, it provides a class decorator metaprogramming framework that intercepts class creation to rewrite the class body, producing dunder methods without manual boilerplate. The library includes a comprehensive attribute validation toolkit with built-in validators for type checks, range constraints, regex matching, length limits, and logical composition of validation rules. The library distinguishes itself through it
Supports generator functions as field transformers during class creation.