Python Internals · interview question

If you wrote a test around closures and scope, what should the test prove first?

Multiple choiceMediumchapter-19-curatedpremiumpython-internalsclosures-and-scope

python

def build_multiplier(factor: int):
    def apply(value: int) -> int:
        return value * factor
    return apply

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

Answer and explanation

Correct answer

A. 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 closures and scope, what should the test prove first?

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