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Mechanisms that create fresh copies of mutable default values for each instance to prevent shared-state bugs.
Distinct from Mutable Default Argument Guards: Distinct from Mutable Default Argument Guards: focuses on class attribute defaults with per-instance copying, not function argument guard patterns.
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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
Provides per-instance mutable default values via factory functions, avoiding shared-state bugs in data classes.