Python Internals · interview question

If you wrote a test around properties and descriptors, what should the test prove first?

Multiple choiceHardchapter-19-curatedpremiumpython-internalsproperties-and-descriptors

python

class InventoryItem:
    @property
    def available(self) -> bool:
        return self.stock > 0

Solve the symptom with comments only and avoid changing the code shape around properties and descriptors.Delay clarity until production traffic reveals the edge case and then patch it under pressure.Keep properties and descriptors implicit so the script stays short and hope the next engineer infers the rule.That the rule behaves correctly at the boundary cases the lesson is trying to make explicit.

Answer and explanation

Correct answer

D. That the rule behaves correctly at the boundary cases the lesson is trying to make explicit.

Why

Good tests make the design safer to change because they lock in the meaningful behavior rather than surface-level implementation details.

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If you wrote a test around properties and descriptors, what should the test prove first?

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