Stacked decorators apply bottom-up

Question

Accepted Answer

Stacked decorators apply bottom-up: `@double` wraps `value` first, then `@add_one` wraps the result. Calling `value()` calls `add_one`'s wrapper, which calls `double`'s wrapper, which calls the original `value()` returning 3. Then `double` multiplies by 2 to get 6, and `add_one` adds 1 to get 7. If the order were reversed the result would be `(3 + 1) * 2 = 8` - so the stacking order matters whenever the decorators interact.