What is the @property decorator?

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**`@property`** turns a method into a **managed attribute**: callers read `obj.area` (no parentheses) and the method runs behind the scenes. It lets you expose a clean attribute-style API while keeping logic — validation, computation, lazy evaluation — behind it. This is Python's answer to Java-style getters/setters: you start with a plain attribute and *upgrade* it to a property later **without changing the calling code**. - A bare `@property` is **read-only** (computed each access). - Add `@.setter` to allow assignment with validation, and `@.deleter` for `del`. Use it for derived values (`full_name` from first+last), validated fields (reject a negative radius), and backward-compatible refactors. Don't hide expensive work behind something that *looks* like a cheap attribute access (use a method or cache it). **Interview tip:** the winning framing is 'attribute syntax, method behavior — so you can add validation/computation without breaking the public API.' Show a sette

What is the @property decorator?

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